Fitness & Coaching Glossary

The maximum load an athlete can lift for a single repetition with proper form on a specific exercise. It is the benchmark for calculating training intensities (e.g., "use 75% of your 1RM on Back Squat").

A 1 to 10 scale measuring perceived exertion in a set. RPE 10 = total failure (cannot complete another rep), RPE 8 = 2 reps left in reserve. Enables daily load autoregulation based on individual readiness.

The number of repetitions remaining before technical failure. RIR 0 = failure, RIR 2 = 2 reps left in reserve. It is the inverse of RPE and intuitive for lifters: "stop with 2 reps in reserve".

Systematic organization of training into phases (mesocycles) with specific targets (volume accumulation, intensification, peaking). Common forms include linear and daily undulating periodization (DUP).

The smallest programming unit, typically corresponding to 1 week of training with its specific session structure, volume, and intensity distribution.

A 4 to 8-week training block with a dedicated objective (volume accumulation, peaking, technical refinement). Concludes with a planned deload.

The annual or seasonal training plan encompassing all mesocycles, predominantly used in athletic programming to peak for competitions.

A scheduled recovery week deliberately reducing volume and/or intensity by 40-60%. Facilitates systemic (neuromuscular, connective, mental) recovery and prevents overtraining. Active recovery, not complete inactivity.

Measure of total mechanical work: Sets × Repetitions × Load (kg). For example, 3 sets of 8 reps with 100 kg = 2,400 kg tonnage. The primary driver of muscular hypertrophy.

The physiological process by which the body, after training stress followed by adequate recovery, adapts to a higher fitness baseline. The bedrock of long-term progress.

Total duration a muscle spends under tension during a set, expressed as Eccentric:Pause:Concentric:Pause (e.g., 3:1:2:0 = 3s descent, 1s pause, 2s ascent, 0s at the top). Higher TUT increases metabolic stress for hypertrophy.

The lowering or lengthening phase of the muscle under load (e.g., the squat descent or lowering the barbell in bench press). Causes the highest mechanical tension and micro-damage. Controlling eccentric tempo is essential for safety and growth.

The lifting or shortening phase of the muscle (e.g., ascending from a squat or pressing the barbell). Should always be performed with maximal intent to move fast to maximize motor unit recruitment.

The point at which another complete repetition cannot be performed with proper form. Training to absolute failure on every set is unnecessary; stopping at 1-3 reps in reserve (RIR 1-3) is optimal for most sets.

Performing two or more exercises consecutively without rest. Antagonistic supersets (e.g., bench press + barbell row) save time; agonistic supersets boost metabolic stress.

High-intensity technique where, upon reaching failure on a set, weight is immediately reduced and additional reps are performed without rest.

Increase in muscle fiber cross-sectional area in response to resistance training. Achieved through moderate loads (60-80% 1RM), high volume, and moderate rest (60-120s).

The maximal force a muscle or muscle group can produce in a single voluntary contraction. Trained with high loads (85-100% 1RM), low repetitions (1-5), and long rest intervals (3-5 min).

The ability to exert maximal force in minimal time (Force × Velocity). Trained with explosive movements (Olympic lifts, box jumps) moved at maximum speed.

Muscle soreness appearing 24-72 hours following intense or eccentric-heavy workouts. Not a direct proxy for workout quality: it diminishes as the body adapts.

A chronic fatigue state occurring when training load consistently exceeds recovery capacity. Symptoms include performance decline, sleep disturbances, and elevated resting heart rate. Prevented via scheduled deloads.

The number of times a muscle group or exercise is trained within a week. For hypertrophy, training each muscle group 2 times per week generally yields superior outcomes to traditional once-weekly splits.

A routine training all major movement patterns and muscle groups in every session. Ideal for beginners and lifters training 2-3 times per week.

A split grouping muscles by function: Push (chest, shoulders, triceps), Pull (back, rear delts, biceps), Legs (quadriceps, hamstrings, calves). Adaptable for 3 to 6 training days per week.

A 4-day split dividing workouts into upper body and lower body sessions. Strikes an optimal balance between training frequency and recovery for intermediate lifters.

The preparatory phase preceding the main workout. Consists of general warm-up (light cardio/mobility to elevate core temperature) and specific progressive warm-up sets on the primary lift.