Fitness Words Explained | WorkOnFitness

Quick Intro

Exercise comes with its own vocabulary, and much of it is simple once explained. This page gives plain meanings for the words beginners meet most often, grouped by topic. Each entry is short, so you can look up a word and get back to training.

Counting the Work

Rep (repetition). One complete movement of an exercise, such as lowering into a squat and standing back up.

Set. A group of reps done one after another without stopping. “Three sets of ten” means ten reps, a rest, ten more, a rest, then ten more.

Rest. The pause between sets. Shorter rests make a session harder for stamina; longer rests let you lift more in the next set.

Volume. The total amount of work, often counted as the number of hard sets per muscle per week.

Load. The weight or resistance you work against, whether a dumbbell, a band or your own body.

Circuit. A sequence of different exercises done one after another with little rest, then repeated.

How Hard You Work

Intensity. How hard an effort is. For strength work, it usually means how heavy the load is compared with the most you can lift. For aerobic work, it means how hard your heart and lungs are working.

Failure. The point in a set where you cannot complete another full rep with good form, despite real effort. It is sometimes called momentary muscular failure. You do not need to reach it often.

Reps in reserve. How many more reps you think you could have done when you stopped a set. Stopping with “two in reserve” means you could have done about two more. It is an estimate, and it gets more accurate with practice. How hard is hard enough? explains how to use it.

RPE (rating of perceived exertion). A number, usually from 1 to 10, describing how hard an effort felt. A 10 is the hardest you could go.

Talk test. A simple check of aerobic effort: if you can talk in full sentences, the effort is easy to moderate; if you can only manage a few words, it is hard.

How You Move

Form (technique). How you perform a movement: your body position, control and path of movement. Good form is controlled and suits your body. It does not mean one perfect position. What good form actually means covers this.

Range of motion. How far a joint moves during an exercise. A full range of motion in a squat means lowering as far as you comfortably and safely can.

Tempo. How fast you move through each part of a rep, such as lowering slowly and standing up quickly.

Compound exercise. An exercise that moves several joints and works several muscles at once, such as a Bodyweight Squat or a Push-up.

Isolation exercise. An exercise that mainly moves one joint and works one muscle group, such as a Dumbbell Bicep Curl.

Bodyweight exercise. An exercise that uses your own body as the resistance.

Isometric. A hold with no movement, such as a Plank or a wall sit.

Planning Your Training

Warm-up. Light movement before a session to raise your temperature and prepare the joints and muscles.

Warm-up set. A lighter set of an exercise before your main sets, to rehearse the movement.

Cool-down. Easy movement at the end of a session to let breathing and heart rate settle. Optional for most sessions.

Progressive overload. Gradually making training harder over time, by adding weight, reps or sets, so your body keeps adapting. See progressive overload.

Deload. A planned easier week, with less volume or intensity, to let the body recover. See deload weeks.

Split. How you divide training across the week, such as upper body one day and lower body the next.

Full-body session. A session that works all the main muscle groups.

Plateau. A period when progress stops. Why progress stops explains what to do.

Types of Training

Cardio (aerobic exercise). Sustained activity that works the heart and lungs, such as walking, cycling or swimming.

Strength training (resistance training). Working muscles against resistance to build strength and muscle.

HIIT (high-intensity interval training). Short bursts of hard effort alternated with easier recovery periods.

Mobility. Training to move joints actively and with control through their full range.

Flexibility. How far a joint can move, often trained with stretching.

Hypertrophy. Muscle growth.

FAQ

How many reps and sets should a beginner do?

For general fitness, two or three sets of about 8 to 15 reps, with the last few reps feeling hard, works well for most exercises.

Do I need to train to failure?

No. Stopping a rep or two short of failure works well and is easier to recover from.

What is the difference between mobility and flexibility?

Flexibility is how far a joint can move. Mobility is being able to move it actively and with control through that range.

What does “progressive overload” mean in practice?

Doing a little more over time: one more rep, a slightly heavier weight or one more set.