NASM-MMACS cheat sheet

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.

Muscle spindle: lies parallel to extrafusal fibers, senses rate and magnitude of lengthening; activation triggers the stretch (myotatic) reflex and increases force output.

Golgi tendon organ: lies in series at the musculotendinous junction, senses tension; high tension triggers autogenic inhibition and reduces force output.

Length-tension relationship: a muscle produces the most force at resting length (optimal actin-myosin overlap) and the least when over-shortened or over-lengthened.

Force-velocity curve: concentric force falls as velocity rises; eccentric actions can produce roughly 1.2-1.6x the force of a maximal isometric action.

Acute variables map to adaptations: heavy loads with long rest favor maximal strength; moderate loads with short rest and high volume favor hypertrophy and muscular endurance.

Type I fibers: high aerobic capacity, fatigue resistant, low force and slow contraction. Type II fibers: high force, fast contraction, fatigable, greater glycolytic capacity.

Energy systems by duration: phosphagen (ATP-PC) for ~0-10 s of maximal work; glycolysis for ~30 s to 2-3 min; oxidative phosphorylation dominates longer, lower-intensity work.

Cardiorespiratory: cardiac output = heart rate x stroke volume; steady-state means oxygen uptake matches demand; excess post-exercise oxygen consumption (EPOC) elevates metabolism after exercise.

Kinesiology: frontal plane movements are abduction/adduction, sagittal plane are flexion/extension, transverse plane are rotation; the ankle is a hinge joint, the hip and shoulder are ball-and-socket.

Preparticipation screening: use a health history and PAR-Q-style questionnaire; a positive cardiovascular, metabolic, or renal disease finding or symptom warrants medical clearance before vigorous exercise.

Static posture assessment is observational only; findings such as foot flattening, knee valgus, or forward head are noted as observations, not diagnoses.

Overhead squat: an anterior or posterior view of the feet turning out, knees adducting/internally rotating, or arms falling forward indicates a compensation to record and retest.

Single-leg squat assesses frontal- and transverse-plane control of the lower extremity; it is scored per side and asymmetries are recorded.

Pushing/pulling and overhead assessments: note scapular winging, elevated shoulders, and low-back arching as compensation categories (e.g., arms fall forward, excessive forward lean).

Flexibility: the sit-and-reach reflects hamstring and low-back extensibility; the shoulder mobility screen compares left and right reach distance with a fist-to-fist gap.

Cardiorespiratory testing: the YMCA 3-minute step test uses a 12-inch bench and post-exercise recovery heart rate; the Rockport 1-mile walk uses time and post-walk heart rate to estimate VO2max.

Strength and power: estimated 1RM from a submaximal load uses the repetition-load relationship; vertical jump and broad jump are field measures of lower-body power.

Body composition: BMI = weight (kg) / height (m)^2; circumference and skinfold measures are estimates with known error, so trends across repeated measures matter more than a single value.

OPT model progression: Stabilization Endurance, then Strength (Endurance, Hypertrophy, Maximal Strength), then Power; each phase sets specific acute variables for intensity, reps, sets, tempo, rest, and exercise selection.

Phase 1 Stabilization Endurance: roughly 12-20 reps, 1-3 sets, low-to-moderate intensity (~50-70% 1RM), slow tempo (e.g., 4/2/1), short rest (0-90 s), proprioceptively challenging and stabilization-focused exercises.

Phase 2 Strength Endurance: superset a strength exercise with a stabilization exercise for the same muscle group, ~8-12 reps, 2-4 sets, moderate rest (0-90 s).

Phase 3 Hypertrophy: 6-12 reps, 3-5 sets, 75-85% 1RM, moderate tempo, 0-60 s rest. Phase 4 Maximal Strength: 1-5 reps, 4-6 sets, 85-100% 1RM, long rest (3-5 min).

Phase 5 Power: 1-10 reps at 30-45% 1RM or body weight, 3-5 sets, explosive tempo, long rest (3-5 min), pairing a strength exercise with a power exercise.

General adaptation syndrome: alarm, resistance, and exhaustion; progressive overload with adequate recovery drives supercompensation, while excessive stress leads to overtraining.

Specificity and the SAID principle: adaptations reflect the exact movement pattern, velocity, joint angle, and energy system trained; the principle of variation prevents plateaus.

Acute variables: repetition, set, training intensity, repetition tempo, rest interval, training volume, training frequency, and exercise selection; changing any one alters the adaptive response.

Periodization: linear models shift from high volume/low intensity to low volume/high intensity; undulating models rotate intensity and volume within a week or session.

Five kinetic chain checkpoints: foot/ankle, knee, lumbo-pelvic-hip complex, shoulder complex, and head; cue from the base up and correct the first checkpoint that fails.

Squat cues: feet shoulder-width and straight, knees tracking over the second and third toes, neutral spine, weight through the whole foot, chest up, and no valgus collapse.

Hinge/deadlift cues: hips back, flat back, bar or load close to the body, shoulders packed, and finish with hip extension rather than lumbar extension.

Overhead press cues: ribs down, core braced, wrists neutral, elbows slightly in front of the bar at the start, and no excessive lumbar arching.

Pulling cues: initiate by retracting and depressing the scapulae, keep the shoulders away from the ears, and avoid using momentum or shrugging.

Plyometric phases: eccentric (loading), amortization (transition, kept short), and concentric (unloading); land softly with knees and hips flexed and hold the landing before progressing.

Balance and core: progress stable to unstable surfaces, two legs to one leg, eyes open to eyes closed; core progressions move from floor to standing and from isometric to dynamic.

Spotting rules: spot only free-weight exercises that pass over the head or face; never spot a power exercise such as a clean or snatch; use a minimum of one spotter for barbell squats and two for heavy overhead lifts.

Warm-up structure: a general warm-up (5-10 min of light activity) followed by a specific warm-up that rehearses the movements and loads to be trained; flexibility work is best placed after activity or as dynamic preparation.