NASM GPTS key terms

A periodized training framework organized into five phases that progress from stabilization to strength to power, with each phase varying exercise selection, sets, reps, intensity, and tempo to match a client's goals and readiness.

OPT phase 1, which uses low-to-moderate loads, high repetitions, slow tempos, and unstable or proprioceptively demanding exercises to improve joint stability, neuromuscular control, and muscular endurance before heavier loading.

The final OPT phase, training the body to produce force quickly using light loads and explosive concentric actions, typically paired with a strength exercise so power output is expressed with control and correct joint alignment.

The manipulable training components a coach sets for each session, including repetition, set, intensity, tempo, rest interval, volume, training frequency, and exercise selection and order.

The speed at which each repetition is performed, usually written as three numbers for the eccentric, isometric, and concentric phases, controlling time under tension and exercise difficulty.

The total amount of work performed in a session or period, commonly expressed as sets multiplied by repetitions multiplied by load, used to progress or regress a client's overall training stress.

The level of effort or load demanded by an exercise, expressed as a percentage of one-repetition maximum, a rate of perceived exertion, or a load that permits only a target number of repetitions.

How quickly a muscle or muscle group can generate force, a key quality trained in the power phase because many daily and sport tasks demand rapid force rather than maximal force alone.

The slope of the force-time curve, describing how rapidly force rises after contraction begins; it reflects explosive strength and is influenced by motor unit recruitment and firing rate.

A single motor neuron and all the muscle fibers it innervates. All fibers in a unit contract together, and units are recruited in order from smaller, slower units to larger, faster ones as force demand rises.

An increase in muscle cross-sectional area resulting from repeated training stress, driven by mechanical tension, metabolic stress, and muscle damage, and supported by adequate protein intake and recovery.

The force transmitted through muscle fibers and connective tissue during contraction; it is a primary driver of hypertrophy and strength adaptation, and it rises with heavier loads and greater effort.

Systematically increasing training demand over time, through load, volume, range of motion, or reduced stability, so the body continues to adapt instead of plateauing at a comfortable stimulus.

The planned organization of training into phases and cycles across time, deliberately varying volume and intensity to peak for goals, manage fatigue, and reduce injury or overtraining risk.

The body's sense of joint position and movement, fed by mechanoreceptors in muscles, tendons, and joints; it underlies balance, coordination, and the ability to react to changing surfaces.

The ability to maintain the body's center of gravity over its base of support, whether standing still or moving; it depends on visual, vestibular, and somatosensory input working together.

Training the trunk musculature, including the abdominals, obliques, and spinal extensors, to control pelvis and spine position during limb movement and load, reducing stress on the low back.

A cueing technique in which the client gently pulls the navel toward the spine to activate the deep abdominal wall, often used to improve trunk stiffness before loaded or unstable exercises.

Co-contracting the abdominal wall, obliques, and spinal extensors to build intra-abdominal pressure and stiffen the trunk, commonly taught before heavy lifts such as squats and deadlifts.

A dynamic screen in which the client squats with arms overhead while the coach observes from front and side, looking for compensations that suggest mobility, stability, or neuromuscular control issues.

A visual inspection of a client standing still, viewed from front, side, and back, to identify joint alignment deviations such as forward head, rounded shoulders, or uneven hips before movement testing.

An altered movement pattern in which one segment moves excessively or insufficiently to complete a task, often reflecting restricted mobility at one joint and poor stability at another.

The extent of movement available at a joint, measured actively or passively; limitations can stem from joint structure, muscle tightness, or soft tissue restriction and influence exercise selection and cueing.

The ability to move a joint or group of joints through an unrestricted, pain-free range of motion, which supports proper exercise technique and can be improved with targeted stretching and soft tissue work.

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

The preparatory portion of a session that raises core temperature, increases blood flow, and rehearses key movement patterns, typically combining general cardiovascular activity with specific dynamic mobility work.

The closing portion of a session that gradually lowers heart rate and returns the body toward resting state, often using low-intensity movement and static stretching while tissues are warm.

The heaviest load a client can lift once with correct technique; it anchors intensity prescriptions, though estimated 1RM from a submaximal set is often safer for general clients.

The greatest load that can be lifted for a specified number of repetitions with good form, such as a 10RM; it is used to set loads without a true maximal test.

A client-reported rating of effort, commonly on a 1-to-10 scale, used to regulate intensity when load-based prescriptions are impractical or when the client is new to training.

The difference between maximum and resting heart rate; multiplying it by a target percentage and adding resting heart rate yields a training heart rate zone for aerobic conditioning.

Planned aerobic and interval exercise that improves the heart, lungs, and blood vessels' ability to deliver oxygen, progressed by manipulating frequency, intensity, time, and type.

The plane that divides the body into upper and lower halves; rotation and twisting movements occur here, and training it supports trunk control and sport-specific power.

The plane dividing the body into left and right halves; forward and backward movements such as squats and lunges occur in it, and most strength exercises are performed here.

The plane dividing the body into front and back halves; side-to-side motions such as lateral lunges and abduction occur here, and training it addresses hip and shoulder stability.

A goal written to be specific, measurable, achievable, relevant, and time-bound, giving the client a clear target and a way to track progress during behavior-change coaching.

A client's belief in their capacity to execute a behavior successfully; it predicts adherence and can be strengthened through mastery experiences, modeling, encouragement, and reduced physiological stress.

A behavior-change model describing progression through precontemplation, contemplation, preparation, action, and maintenance, guiding coaches to match strategies to the client's current readiness rather than pushing action too early.

A client-centered conversational style that uses open questions, reflective listening, and affirmation to surface and strengthen the client's own reasons for change, rather than advising or persuading.

Fully attending to a client's words, tone, and body language, then reflecting back content and feeling to confirm understanding; it builds trust and reveals barriers that shape program decisions.

The trusting, respectful connection between coach and client, built through consistent communication, reliability, and genuine interest, which supports adherence and honest reporting of problems.

The legally defined boundary of what a fitness professional may do, including screening, programming, and coaching, while referring medical diagnosis, treatment, and diet prescription to licensed providers.

A client's voluntary agreement to participate after receiving clear information about the assessment or program, its risks and benefits, and their right to stop or ask questions at any time.

The process of gathering health history, current symptoms, medications, and activity level to decide whether exercise is appropriate, needs medical clearance, or requires program modification.

Directing a client to an appropriate licensed professional, such as a physician or physical therapist, when findings fall outside the trainer's scope or when symptoms suggest a medical concern.