Fitness Terminology Glossary: Every Term You Need to Know

The fitness world is full of jargon, acronyms, and terminology that can be confusing for newcomers and experienced exercisers alike. This comprehensive glossary explains the most common fitness terms so you can navigate the gym, understand programs, and communicate effectively about training.

Training Terms

Basic Concepts

Rep (Repetition): One complete movement of an exercise. Example: One push-up from down to up is one rep.

Set: A group of consecutive reps. Example: 3 sets of 10 reps means performing 10 reps, resting, then repeating two more times.

Volume: Total amount of work performed. Usually calculated as sets × reps × weight. Higher volume generally means more stimulus.

Intensity: How heavy the weight is relative to your maximum. Often expressed as percentage of 1RM or RPE.

Frequency: How often you train a muscle or perform a workout per week.

Progressive Overload: Gradually increasing the demands placed on your body over time—more weight, reps, sets, or improved technique.

Rest Period: Time between sets for recovery.

Tempo: Speed of each phase of a lift. Written as four numbers (e.g., 3-1-2-0): eccentric-pause-concentric-pause.

Muscle Actions

Concentric: The lifting or shortening phase of a movement. Example: Curling the weight up in a bicep curl.

Eccentric: The lowering or lengthening phase. Example: Lowering the weight in a bicep curl.

Isometric: Holding a position without movement. Example: Holding a plank or wall sit.

Effort Measurements

1RM (One Rep Max): The maximum weight you can lift for one repetition with proper form.

RPE (Rate of Perceived Exertion): Scale of 1-10 rating how hard a set feels. RPE 10 = maximum effort.

RIR (Reps in Reserve): How many more reps you could have done. 2 RIR = you stopped with 2 reps left.

Failure: The point where you cannot complete another rep despite maximum effort.

AMRAP (As Many Reps As Possible): Perform as many reps as you can in a set or time period.

Training Types

Hypertrophy: Training focused on muscle growth. Typically moderate weights, 8-12 reps.

Strength Training: Training focused on maximal force production. Heavier weights, lower reps (1-6).

Power Training: Training focused on explosive force (force × velocity). Olympic lifts, jumps, throws.

Endurance Training: Training focused on sustained effort. Higher reps (15+) or cardiovascular work.

Conditioning: Training that improves cardiovascular fitness and work capacity.

HIIT (High-Intensity Interval Training): Alternating periods of intense effort and recovery.

LISS (Low-Intensity Steady State): Sustained low-intensity cardio (walking, easy cycling).

Plyometrics: Explosive jumping and bounding exercises that utilize the stretch-shortening cycle.

Program Design Terms

Split: How training is divided across the week. Examples: Push/Pull/Legs, Upper/Lower, Full Body.

Superset: Two exercises performed back-to-back without rest.

Compound Set: Two exercises for the same muscle group performed back-to-back.

Tri-Set/Giant Set: Three or four exercises performed consecutively.

Drop Set: Performing a set to failure, reducing weight, and continuing immediately.

Rest-Pause: Performing a set, resting briefly (10-20 sec), then continuing.

Deload: A planned reduction in training volume/intensity for recovery.

Periodization: Planned variation of training variables over time to optimize results.

Mesocycle: A training block, typically 3-6 weeks with a specific focus.

Microcycle: Usually one week of training.

Macrocycle: An entire training season or year.

Exercise Categories

Compound Exercise: Exercises that work multiple joints and muscle groups. Examples: Squat, deadlift, bench press.

Isolation Exercise: Exercises that target a single muscle group through one joint. Examples: Bicep curl, leg extension.

Accessory/Assistance Exercise: Supplementary exercises supporting main lifts.

Functional Training: Training that mimics real-world movements and improves daily function.

Unilateral: Working one limb at a time. Example: Single-leg squat.

Bilateral: Working both limbs together. Example: Barbell squat.

Anatomy and Muscle Terms

Major Muscle Groups

Quads (Quadriceps): Front of the thigh. Four muscles responsible for knee extension.

Hamstrings: Back of the thigh. Three muscles responsible for knee flexion and hip extension.

Glutes (Gluteal muscles): The buttocks. Glute max (largest), glute med, glute min.

Hip Flexors: Front of the hip. Psoas and iliacus primarily.

Calves: Back of the lower leg. Gastrocnemius and soleus.

Core: Muscles of the trunk including abs, obliques, lower back, and deep stabilizers.

Pecs (Pectorals): Chest muscles. Pec major and pec minor.

Lats (Latissimus Dorsi): Large back muscles creating V-shape.

Traps (Trapezius): Upper back and neck muscles. Upper, middle, and lower portions.

Delts (Deltoids): Shoulder muscles. Anterior (front), lateral (side), posterior (rear).

Biceps: Front of upper arm. Two-headed muscle.

Triceps: Back of upper arm. Three-headed muscle.

Forearms: Lower arm muscles. Flexors and extensors.

Anatomical Terms

Anterior: Front of the body.

Posterior: Back of the body.

Medial: Toward the midline.

Lateral: Away from the midline.

Proximal: Closer to the trunk/center.

Distal: Farther from the trunk.

Flexion: Decreasing the angle at a joint (bending).

Extension: Increasing the angle at a joint (straightening).

Abduction: Moving away from the midline.

Adduction: Moving toward the midline.

Rotation: Turning around an axis. Internal (inward) or external (outward).

Nutrition Terms

Basics

Calorie: Unit of energy in food. Technically a kilocalorie (kcal).

Macronutrients (Macros): Nutrients providing calories: protein, carbohydrates, fat.

Micronutrients: Vitamins and minerals needed in smaller amounts.

TDEE (Total Daily Energy Expenditure): Total calories burned in a day.

BMR (Basal Metabolic Rate): Calories burned at complete rest.

Deficit: Eating fewer calories than you burn (for fat loss).

Surplus: Eating more calories than you burn (for muscle gain).

Maintenance: Eating calories equal to expenditure (weight stable).

Specific Concepts

Protein Synthesis (MPS): The process of building new muscle protein.

Glycogen: Stored form of carbohydrate in muscles and liver.

Thermic Effect of Food (TEF): Calories burned digesting food.

NEAT (Non-Exercise Activity Thermogenesis): Calories burned through daily movement (not exercise).

Anabolic: Building up. Muscle growth is anabolic.

Catabolic: Breaking down. Muscle loss is catabolic.

Nutrition Strategies

IIFYM (If It Fits Your Macros): Flexible dieting focusing on hitting macro targets.

Intermittent Fasting: Time-restricted eating patterns.

Carb Cycling: Varying carbohydrate intake on different days.

Recomp (Body Recomposition): Losing fat and building muscle simultaneously.

Bulking: Phase of caloric surplus to maximize muscle gain.

Cutting: Phase of caloric deficit to lose fat.

Recovery Terms

DOMS (Delayed Onset Muscle Soreness): Muscle soreness appearing 24-72 hours after exercise.

Active Recovery: Light activity on rest days to promote recovery.

Supercompensation: The body's adaptation above baseline after recovery from training stress.

Overtraining: Chronic state of inadequate recovery leading to performance decline.

Overreaching: Short-term excessive training that can be recovered from.

Adaptation: The body's adjustment to training stress, becoming fitter/stronger.

HRV (Heart Rate Variability): Variation in time between heartbeats; used to assess recovery.

Common Abbreviations

Exercises

BB: Barbell DB: Dumbbell KB: Kettlebell BW: Body weight RDL: Romanian Deadlift SLDL: Straight-Leg Deadlift OHP: Overhead Press BP: Bench Press

Programs/Movements

PPL: Push/Pull/Legs (training split) UL: Upper/Lower (training split) FB: Full Body SS: Starting Strength (or Superset) SL: StrongLifts ROM: Range of Motion TUT: Time Under Tension

Measurements

BF%: Body Fat Percentage LBM: Lean Body Mass BMI: Body Mass Index PR/PB: Personal Record/Best RM: Rep Max

Gym Equipment

Barbell: Long bar (typically 7 feet) loaded with plates.

Dumbbell: Single-hand weight.

Kettlebell: Ball-shaped weight with handle.

EZ Bar: Curved barbell reducing wrist strain.

Trap Bar/Hex Bar: Hexagonal bar you stand inside.

Smith Machine: Barbell on fixed vertical track.

Cable Machine: Adjustable pulley system.

Resistance Band: Elastic band providing resistance.

Foam Roller: Cylindrical tool for self-myofascial release.

Power Rack/Squat Rack: Structure for safely performing barbell exercises.

Bench: Flat, incline, or adjustable surface for exercises.

Pull-Up Bar: Bar for hanging and pulling exercises.

Plates: Weight discs loaded onto barbells.

Bumper Plates: Rubber plates designed to be dropped (Olympic lifting).

Collars/Clips: Secure plates on barbell.

Body Types and Conditions

Ectomorph: Naturally lean, thin build (outdated concept but commonly used).

Mesomorph: Naturally muscular, athletic build.

Endomorph: Naturally heavier, rounder build.

Sarcopenia: Age-related muscle loss.

Hypertrophy: Increase in muscle size.

Atrophy: Decrease in muscle size.

Movement Patterns

Hinge: Hip-dominant movement. Examples: Deadlift, RDL.

Squat: Knee-dominant movement. Examples: Back squat, front squat.

Push: Pressing movements. Examples: Bench press, shoulder press.

Pull: Pulling movements. Examples: Rows, pull-ups.

Carry: Loaded walking. Examples: Farmer carry.

Rotation: Rotational movements. Examples: Woodchops, Russian twists.

Anti-movement: Resisting movement (anti-extension, anti-rotation, etc.).

Common Cues

Brace: Tighten core muscles as if preparing to be punched.

Squeeze: Contract the target muscle deliberately.

Drive: Push forcefully.

Retract: Pull shoulder blades together.

Protract: Push shoulder blades apart.

Hinge: Bend at hips while keeping spine neutral.

Lock Out: Fully extend a joint (typically at top of movement).

Neutral Spine: Maintaining natural spinal curves.

Quick Reference Chart

| Abbreviation | Meaning | |-------------|---------| | 1RM | One Rep Max | | AMRAP | As Many Reps As Possible | | BB | Barbell | | BW | Body Weight | | DB | Dumbbell | | DOMS | Delayed Onset Muscle Soreness | | HIIT | High-Intensity Interval Training | | LISS | Low-Intensity Steady State | | OHP | Overhead Press | | PPL | Push/Pull/Legs | | PR | Personal Record | | RDL | Romanian Deadlift | | RIR | Reps in Reserve | | ROM | Range of Motion | | RPE | Rate of Perceived Exertion | | TDEE | Total Daily Energy Expenditure |

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Fitness terminology can seem like a foreign language, but understanding these terms will help you follow programs, communicate with trainers, and take control of your training. Bookmark this guide for reference as you continue your fitness journey.