ISSA Strength & Conditioning key terms

The speed at which an athlete can increase force output during a contraction, measured as the slope of the force-time curve. High RFD supports explosive actions like sprint starts, jumps, and rapid direction changes.

A model showing that as movement velocity increases, the force an athlete can produce decreases, and vice versa. Coaches use it to select loads that train heavy-force, high-velocity, or mixed power qualities.

The rate of doing work, calculated as force multiplied by velocity. In training it describes how quickly an athlete applies force, which matters for jumping, throwing, sprinting, and striking.

The sequence in which a muscle is rapidly lengthened (eccentric phase), briefly held, then shortened (concentric phase), producing more force than a concentric action alone. It underlies jumping, sprinting, and rebounding actions.

Training that emphasizes the lengthening phase of a muscle action, such as lowering a load slowly or controlling a landing. It builds strength and tissue tolerance at relatively low metabolic cost but causes notable muscle soreness.

A muscle action in which the muscle shortens while producing force, such as rising from a squat or driving the leg during a sprint push-off. It is the phase most often associated with accelerating a load or the body.

A muscle action in which force is produced without a change in joint angle or muscle length, such as a wall sit or plank hold. Isometrics build positional strength and can be used for tendon rehabilitation.

The principle of gradually increasing training stress-through load, volume, density, or complexity-so the body continues to adapt. Overload must be applied in manageable steps to avoid injury and stagnation.

The total amount of work performed, commonly expressed as sets multiplied by repetitions multiplied by load, or as total distance or time. Volume drives hypertrophy and work capacity but raises fatigue when excessive.

The level of effort or load relative to an athlete's maximum capacity, often expressed as a percentage of 1RM, RPE, or velocity. Intensity primarily influences maximal strength and power adaptations.

The heaviest load an athlete can lift once with acceptable technique. It anchors percentage-based programming and can be estimated from a multi-rep test to reduce testing risk.

A subjective scale on which an athlete rates how hard a set or session felt. RPE-based loading lets coaches adjust training to daily readiness without frequent maximal testing.

A method of prescribing and adjusting load by measuring barbell or body movement speed, often with a linear position transducer. It uses velocity loss within a set as a marker of fatigue and training stimulus.

Adjusting training load or volume on a given day based on the athlete's readiness, performance, or perceived effort. It keeps the intended stimulus despite fluctuations in fatigue, sleep, or stress.

The planned organization of training into phases with specific goals, such as accumulation, intensification, and peaking. It manages fatigue and fitness so performance peaks at the right competition.

The longest planning block, typically a full season or training year, built from several mesocycles. It maps long-term goals such as building a base, competing, and recovering.

A training block of several weeks within a macrocycle, usually targeting one main adaptation such as hypertrophy, strength, or power. It commonly ends with a lighter week or deload.

The shortest planning unit, usually a week, detailing daily sessions, loads, and recovery. It arranges hard and easy days to balance training stimulus with restoration.

A planned reduction in volume or intensity, often within a mesocycle, that allows accumulated fatigue to dissipate while fitness is retained. Deloads are typically scheduled rather than reactive.

A progressive reduction in training load before competition designed to dissipate fatigue while preserving fitness. A well-executed taper typically improves performance and lasts one to three weeks.

The phase in which training volume drops and intensity or specificity rises so the athlete reaches top performance on competition day. Peaking relies on prior training and careful fatigue management.

Programming strength and endurance work in the same training plan. When poorly sequenced, high-volume endurance work can blunt strength and power gains, so coaches manage order, spacing, and volume.

Exercises involving rapid stretch-shortening actions such as jumps, bounds, and hops. They train explosive power and reactive ability, requiring adequate strength and landing control beforehand.

The duration a foot stays in contact with the ground during a running, jumping, or hopping action. Shorter contact times generally indicate better reactive power and are monitored in plyometric and sprint work.

A ratio of jump height to ground contact time, used to quantify an athlete's ability to use the stretch-shortening cycle. Higher values suggest better reactive power and plyometric readiness.

A vertical jump that begins with a rapid downward dip before takeoff, using the stretch-shortening cycle. It is a common field test for lower-body power and can be tracked to monitor fatigue.

Assessing vertical or horizontal jump performance to monitor power and neuromuscular readiness. Reliable protocols use consistent warm-up, hand placement, and surface, and compare results to an athlete's baseline.

The technical elements of efficient running, including posture, leg recovery, foot strike, and arm action. Good mechanics improve force application and reduce injury risk during acceleration and maximum-velocity running.

The rate of change of velocity, or the phase of sprinting in which an athlete builds speed over the first steps. It depends on horizontal force production, body lean, and powerful push-off.

Systematic work to improve acceleration, maximum velocity, or speed endurance. It requires adequate rest between efforts so quality stays high and technique does not degrade.

Training that develops the energy systems and work capacity needed to sustain effort and recover between bouts. It should be dosed to support sport demands without eroding strength or power.

The phosphagen, glycolytic, and oxidative pathways that supply adenosine triphosphate for muscle work. Each dominates different effort durations, which guides rest intervals and conditioning design.

The exercise intensity at which blood lactate begins to accumulate faster than it is cleared. It marks a useful boundary for aerobic conditioning and tempo work in team-sport athletes.

Collecting daily or weekly data such as sleep, soreness, wellness questionnaires, or jump performance to gauge an athlete's state. It informs load adjustments and flags accumulating fatigue.

Ongoing tracking of training load, recovery, and performance to guide programming decisions. Good systems use consistent measures and act on trends rather than single data points.

The cumulative stress of training on an athlete, often estimated as session duration multiplied by perceived exertion. Tracking load helps balance adaptation with injury and overtraining risk.

The processes and practices that restore the body after training, including sleep, nutrition, and low-intensity activity. Adequate recovery is required for adaptation and for safe progression.

Muscle soreness that appears hours to days after unfamiliar or eccentric-heavy exercise. It is not a reliable measure of training quality and should not automatically dictate program changes.

A prolonged performance decline with mood, sleep, and hormonal disturbances resulting from excessive training stress with insufficient recovery. It requires rest and medical evaluation, not simply more training.

The process by which athletes acquire and refine movement skills through practice and feedback. Coaching choices such as cueing, demonstration, and variability shape how well skills transfer to competition.

Directing an athlete's attention to the effect of a movement, such as the target or the ground, rather than to body parts. It often improves performance and learning compared with internal focus.

Short verbal, visual, or tactile prompts that guide an athlete's movement. Effective cues are brief, specific, and timed well, and are refined based on how the athlete responds.

The development of technically proficient, adaptable movement through practice design, feedback, and repetition. It progresses from conscious control toward automatic execution under competitive pressure.

The state in which an athlete has the fitness, freshness, and tactical preparation to perform on a given day. It is built through periodization, tapering, and monitoring rather than last-minute training.