Gym and Fitness English: Words for a Workout

Gym English is mostly a handful of verbs and short phrases: you work out, you warm up, you do a set of ten, and the next morning you're sore. This guide follows one visit from start to finish — the words for joining, the words you hear on the floor, and the words for how you feel afterward.

Prefer to hear it first? The podcast episode 12 Gym Phrases walks through the same phrases, from the first day to the morning after.

Exercise, work out, train: the three verbs

All three can describe physical activity, with different emphasis:

As a noun, exercise is usually uncountable when it means physical activity (I need more exercise) and countable when it means one movement or task (a stretching exercise, a grammar exercise). For the wider pattern of go swimming / play tennis / do yoga, see our guide to hobbies and free time.

Getting started: shape, fitness, and a membership

Shape and fitness. Get is the change; stay is keeping it.

Joining. You join a gym or sign up, and what you pay for is a gym membership.

Where you exercise is usually at the gym: I work out at the gym; she's at the gym right now — like at work or at school. In the gym is also possible, and more literal: physically inside the room.

On the gym floor: warm-ups, machines, and weights

Before and after. Warm up and stretch are not the same thing: one is light movement to get ready, the other lengthens a muscle. Both work as nouns too: a warm-up, a stretch.

Things in the room.

Reps and sets. One movement is a rep (short for repetition). A group of reps without a break is a set. So a trainer says three sets of ten: ten reps, a short break, ten more, a break, ten more.

The main vocabulary here is American English. In British English you may also hear do weights for lift weights and keep fit for stay fit.

How you feel: during, after, and the morning after

During. When you're breathing hard and need a moment:

The morning after. Sore is a feeling — your muscles ache a little. Pull a muscle is an injury. Keep the two apart.

Being sore doesn't measure the workout — it only describes how you feel, and it's common after a new activity. If something feels really wrong, the words you need are in our guide to English at the doctor's.

A short conversation at the gym

Maya has a new membership. Sam already works out there.

Get in shape is the goal, warm up and a set of ten are the work, and out of breath is how Maya feels during it. In this example, sore describes how the muscles may feel afterward. The word describes pain or tenderness; it does not identify the cause.

Common mistakes

“I workout every day.” The verb is two words: work out. The noun is one word: a workout.

Train is also valid for physical training, including at a gym: I train at the gym every day. It often suggests a structured program or a sporting goal.

“I made a workout.” A workout takes the verb do, not make. The same split is in our guide to make vs do.

“I am good shape.” Use the preposition in: in good shape. This describes your physical fitness.

“Fit” when you mean thin. Fit means healthy and strong, usually because you exercise. Size is thin or slim. You can be slim and out of shape, or fit without being thin.

In informal British English, fit can also mean attractive. It still does not mean thin.

“My muscles have pain.” English uses the adjective sore, or the verb hurt / ache.

“Out of breathe.” Use the noun breath after out of. Breathe is the verb: I need a moment to breathe.

Out of breath describes your breathing now; out of shape describes your general fitness. Both can be true: I’m so out of shape that I’m out of breath after one flight of stairs.

“Ten repeats” and “a serie.” The gym words are reps and a set.

Quick exercise

Complete sentences 1–7 with these words, using each once: breath, membership, out, sets, shape, sore, up. In number 8, choose one of the two words.

1. I work ___ three times a week, usually before work.
2. Don't forget to warm ___ before you lift anything heavy.
3. Do three ___ of ten, with a short break between them.
4. I'm so out of ___ these days — I haven't exercised since last year.
5. Slow down… I'm out of ___. Give me a second.
6. My arms are really ___ from yesterday's workout.
7. I haven't been to the gym since February. I should cancel my ___.
8. She's ___ for her first half marathon in May. (training / working out)

Frequently asked questions

Is it “work out” or “train” in English?

For normal exercise at the gym, the everyday verb is “work out”: I work out three times a week. “Train” can describe structured physical training, often for a sport or an event: She's training for a marathon.

What is the difference between “I'm sore” and “I pulled a muscle”?

“I'm sore” describes a feeling: your muscles ache a little, often the day after exercise. “I pulled a muscle” describes an injury — a muscle was stretched too far and hurts.

Do you say “in the gym” or “at the gym”?

Both are possible, but “at the gym” is the usual choice for the place where you exercise: I work out at the gym; she's at the gym right now. “In the gym” is more literal — physically inside the room.