NASM-BCS key terms

The relative proportion of fat mass to fat-free mass (muscle, bone, water, organs) in the body, commonly estimated with skinfolds, bioelectrical impedance, or circumference measures.

A screening ratio of weight in kilograms to height in meters squared that flags weight status categories but does not distinguish fat from lean tissue.

A field technique that pinches subcutaneous fat at standardized sites with calipers to estimate body fat percentage using population-specific prediction equations.

A transitional movement screen in which the client squats with arms overhead, revealing compensations such as excessive forward lean, knee valgus, or arms falling forward.

A closed-chain upper-body stability test in which the client holds a push-up position with feet on a bench and hands on the floor, scored by how long the position is maintained.

A muscular endurance assessment counting consecutive full push-ups performed to fatigue with strict form, commonly used to track upper-body endurance over time.

A muscular endurance protocol in which the client performs as many repetitions as possible at a fixed cadence with a standardized load, often 80 pounds for men and 35 pounds for women.

A muscular endurance assessment counting consecutive bodyweight squats to a set cadence or depth, used to monitor lower-body endurance and progress.

A submaximal cardiorespiratory test in which the client walks one mile as fast as possible while heart rate is recorded at completion, and time, heart rate, age, sex, and weight estimate VO2max.

A submaximal cycle ergometer test using incremental workloads and steady-state heart rate to estimate cardiorespiratory fitness without maximal effort.

Alignment and joint position maintained while the body is moving, assessed through transitional screens rather than static standing observation.

The alignment of body segments observed while a client stands still, typically viewed from anterior, lateral, and posterior positions to identify deviations.

A technique that lengthens tissue by holding a joint near end range for a sustained period, often 30 seconds, typically performed after activity or when flexibility is the goal.

Active movement through a joint's full range at controlled speed, used in warm-ups to raise tissue temperature and prepare the nervous system for training.

A neuromuscular response in which sustained tension in a muscle triggers Golgi tendon organ signaling that reduces that muscle's excitation, allowing greater stretch tolerance.

The nervous system's reduction of tension in an antagonist muscle while the agonist contracts, a principle used to facilitate stretching and coordinated movement.

The training parameters a coach manipulates in a session: repetition range, sets, intensity, tempo, rest intervals, exercise choice, and training frequency.

The total amount of work performed, often expressed as sets multiplied by repetitions multiplied by load, used to gauge cumulative stress and plan progression.

Systematically increasing training demand over time by adjusting load, volume, or complexity so that adaptation continues without exceeding recovery capacity.

Planned manipulation of training variables across cycles, from sessions to months, to manage fatigue, peak performance, and long-term progression.

A planned reduction in training volume or intensity, typically lasting a week, that allows recovery and consolidation before resuming higher demand.

A client-reported rating of effort during exercise, commonly on a 0-to-10 scale, used to gauge and adjust intensity without direct physiological measurement.

The difference between estimated maximal heart rate and resting heart rate, used with the Karvonen formula to set target training heart rates.

The maximum rate at which the body can take up and use oxygen during intense exercise, expressed per kilogram of body weight and considered the primary marker of aerobic capacity.

The immediate energy pathway that regenerates ATP from stored creatine phosphate for very brief, high-intensity efforts lasting roughly ten seconds or less.

The breakdown of glucose to pyruvate, producing small amounts of ATP and supporting short bursts of moderate-to-high intensity work before oxidative metabolism dominates.

The aerobic pathway that produces ATP from carbohydrates and fats with oxygen in the mitochondria, sustaining longer-duration activity at lower intensity.

A sensory receptor embedded in muscle that detects stretch and rate of stretch, triggering a reflexive contraction that influences movement control and flexibility.

A receptor at the muscle-tendon junction that senses tension and, when tension is high, inhibits the muscle to reduce force and protect tissue.

A postural compensation pattern of tight upper trapezius, levator scapulae, and pectorals with weak deep cervical flexors and lower trapezius, often seen as forward head and rounded shoulders.

A pattern of tight hip flexors and lumbar extensors with weak gluteals and abdominals, typically presenting as anterior pelvic tilt and increased lumbar lordosis.

An inward collapse of the knees during squatting or landing, driven by hip abductor weakness or altered motor control and linked to lower-extremity injury risk.

A compound lower-body pattern in which the hips and knees flex and extend with the spine neutral, heels grounded, and knees tracking in line with the feet.

A hip-dominant pattern in which the client pushes the hips back with a neutral spine and slight knee bend, loading the posterior chain as in deadlifts and Romanian deadlifts.

Assisting a lifter during a set to prevent injury or failed repetitions, applied to free-weight pressing and squatting movements but not to most machine or cable exercises.

A condition, symptom, or circumstance that makes a given exercise or assessment inappropriate or unsafe for a client and requires modification or referral.

The legally defined boundary of services a certified professional may deliver, which for fitness coaches excludes diagnosis, prescription, and treatment of medical conditions.

Directing a client to a qualified health professional when needs exceed the coach's training, such as pain, injury, or medical symptoms during exercise.

Obtaining a client's voluntary agreement to participate or be assessed after explaining purpose, procedures, risks, benefits, and alternatives in understandable language.

A structured pre-participation review of medical history, symptoms, and risk factors used to decide whether exercise is safe and whether clearance is needed.

A behavior model describing readiness as precontemplation, contemplation, preparation, action, and maintenance, with coaching strategies matched to each stage.

A client's belief in their capacity to perform a specific behavior successfully, shaped by past success, modeling, encouragement, and interpretation of physiological states.

A collaborative conversation style using open questions, reflective listening, and affirmation to strengthen a client's own reasons for change rather than directing them.

A goal written to be specific, measurable, achievable, relevant, and time-bound, which makes progress observable and supports adherence.

Tracking one's own behavior, such as logging food or workouts, which raises awareness and is associated with improved adherence and outcomes.

Carbohydrate, protein, and fat, the energy-yielding nutrients that supply calories and building materials in amounts the body cannot synthesize in sufficient quantity.

Daily protein consumed, ideally distributed across meals, to support muscle repair and adaptation; active adults commonly target roughly 1.2 to 2.0 grams per kilogram of body weight.

The relationship between calories consumed and calories expended; a surplus supports weight gain and a deficit supports weight loss over time.

Maintaining adequate body water before, during, and after exercise to support thermoregulation, blood volume, and performance, adjusted for sweat losses and environment.

Clear limits on the coach-client relationship that keep interactions appropriate, distinguish coaching from therapy or medicine, and protect both parties.

The obligation to protect client health information and share it only with consent or as required by law, using secure storage for records and assessments.

Ongoing learning through courses, workshops, and recertification requirements that keeps a professional's knowledge current and credentials valid.