Hypertrophy Glossary | Corrective Strength

Hypertrophy Training Glossary

A clear, clinical breakdown of the terms that shape effective muscle‑building and corrective strength programming.

Abdomen:

the region between the diaphragm and the pelvis

Abduction:

The lateral movement away form the midline of the trunk

Acetabulum:

the round cavity on the external surface of the coxal bone; the head of the femur articulates with the acetabulum to form the coxal joint

Achilles tendon:

Tendon that connects to the calf muscles of the leg to the heel

Achilles tendonitis:

Inflammation of the Achilles tendon

Actin and myosin:

The most fundamental unit of muscle; cells that are the two primary parts of a muscle fiber and that generate contraction, force, and movement

Adduction:

The medial movement toward the midline of the trunk.

Adhesion:

abnormal adherence of collagen fibers to surrounding structures during immobilization, following trauma or as a complication of surgery, which restricts normal elasticity of the structures involved

Alpha system:

The system of nerves that control the extrafusal muscle fibers

Ambulation:

The act of or action of moving about (walking)

Anatomical position:

erect posture with face forward, arms at sides, forearms supinated (so that palms of the hands face forward) and fingers and thumbs in extension

Antagonist:

A muscle that acts in physiologic opposition by contracting

Antalgic gait:

An awkward manner of walking due to pain.

Antecubital:

the anterior side of the elbow

toward the front, or ventral, surface

Anterior tilt of pelvis:

tilt in which the vertical plane through the anterior superior iliac spine (ASIS) is anterior to the vertical plane through the symphysis pubis

Appendage:

a structure attached to the body, such as the upper and lower extremities

Arm:

the portion of the upper limb between the shoulder and elbow joint

Arndt-Schultz principle:

Guideline as to how much stimulus causes desired physiologic effects and responses

Arthrology:

the study of joints

Articular facet:

a small articular surface of a bone, especially a vertebra

Articular facet:

a small articular surface of a bone, especially a vertebra

Ascending sensory nerve pathways:

Nerves that deliver sensory information to the CNS and the brain

Atlas:

first cervical vertebra, articulating with the occipital bone and rotating around the odontoid process of the axis

Axis:

the second cervical vertebra

Hypertrophy Training

Training designed to stimulate muscle growth—or maintain muscle tissue during fat‑loss phases—by applying mechanical tension, metabolic stress, and progressive overload. This includes both direct muscle‑building work and training that improves the systems supporting long‑term hypertrophy.

Exercise

A specific movement pattern used to challenge a muscle or group of muscles. Exercises are typically named by their biomechanics or common gym terminology (e.g., Deadlift, Overhead Barbell Triceps Extension).

Repetition (Rep)

One full execution of an exercise: starting position → full range of motion → return to the starting position.

1RM / 2RM / 3RM

Your repetition maximum—the heaviest load you can lift for a given number of reps.

1RM: Max load for one rep
2RM: Max load for two reps
3RM: Max load for three reps
Used to determine loading and intensity prescriptions.

Set

A series of continuous repetitions followed by a rest period.

Training Session

A dedicated workout consisting of a warm‑up and one or more exercises.

Rest Time

Recovery time between sets, exercises, or sessions. Most commonly refers to rest between sets.

Microcycle

The smallest repeatable unit of training—typically one week—containing all sessions and rest days.

Scientific Principles of Hypertrophy Training

Mesocycle

A structured sequence of microcycles designed to produce specific adaptations. Usually includes an accumulation phase followed by a deload phase.

Accumulation Phase

The progressive portion of a mesocycle where training difficulty increases through added sets, reps, load, or relative effort.

Deload Phase

A lower‑volume, lower‑intensity microcycle used to reduce fatigue while maintaining adaptations.

Accumulation‑to‑Deload Ratio

The balance of hard training weeks to deload weeks within a mesocycle.

Block

One or more mesocycles organized around a unified goal (e.g., muscle gain, fat loss).

Macrocycle

A long‑term sequence of training blocks aimed at achieving a major performance or physique goal. Typically includes 1–4 blocks.

Periodization

The strategic organization of training variables to maximize progress, reduce injury risk, and peak performance at the right time.

Autoregulation

Adjusting training variables based on real‑time feedback—fatigue, performance, recovery—rather than rigid predetermined plans.

Training Variables

Volume

Total mechanical work performed. In hypertrophy training, volume is most commonly measured as sets per session or sets per week.

Load (Absolute Intensity)

The actual weight used in an exercise (e.g., squatting 225 lb = 225 lb load).

Relative Load

Load expressed as a percentage of your 1RM for that exercise.

Relative Effort

How hard a set feels relative to your maximum ability. In hypertrophy training, this is measured using Reps in Reserve (RIR).

Reps in Reserve (RIR)

How many reps you could still perform before reaching muscular failure.

2 RIR: Stop the set when you feel you could perform two more reps with proper technique.

Frequency

How often you train a muscle group, exercise, or session per week.

Volume Landmarks

Maintenance Volume (MV)

The minimum amount of training needed to maintain muscle mass.

Minimum Effective Volume (MEV)

The lowest amount of training that begins producing measurable muscle growth.

Maximum Adaptive Volume (MAV)

The training volume that produces the fastest and most efficient muscle growth at a given time.

Maximum Recoverable Volume (MRV)

The upper limit of training volume you can recover from. Exceeding MRV leads to stagnation or regression.

Fatigue & Recovery

Fatigue

Performance decline caused by accumulated physical and psychological stress. Can be local (specific muscles) or systemic (whole‑body).

Overreaching

A temporary state where fatigue exceeds your ability to sustain overload training.

Functional overreaching: Planned at the end of an accumulation phase to drive higher adaptation after a deload.
Non‑functional overreaching: Unplanned fatigue that disrupts training progress.

Nutrition & Body Composition Phases

Minicut

A short, aggressive fat‑loss phase used to improve appearance or prime the body for more productive muscle gain.

Muscle Gain Phase (Massing)

A hypercaloric phase paired with hypertrophy training to maximize muscle growth.

Fat Loss Phase (Cutting)

A hypocaloric phase designed to reduce body fat while maintaining muscle mass.

Weight Maintenance Phase

A eucaloric phase where body weight remains stable. Often paired with a resensitization phase to reduce fatigue and restore responsiveness to training.