English for Personal Trainers: Fitness and Coaching Vocabulary

A "rep" (short for repetition) is one complete performance of an exercise movement, from the starting position through the full range of motion and back. A "set" is a group of consecutive reps performed without stopping, followed by a rest period before the next set begins. For example, "3 sets of 12 reps" means performing the exercise 12 times, resting, repeating that 12 times again, resting, and then doing a final 12 repetitions — three separate blocks of 12 reps each. This vocabulary is fundamental to every workout programme written or spoken in English, and trainers use it constantly when giving instructions or designing training plans.

Progressive overload is the training principle that muscles only continue to grow stronger when they are gradually and consistently challenged beyond what they are already used to, achieved by slowly increasing weight, repetitions, sets, or difficulty over time. Without progressive overload, the body adapts to a fixed level of stress and stops improving — a plateau. English-language fitness content refers to this principle constantly, whether discussing strength training, endurance training, or general fitness, and personal trainers structure client programmes specifically around applying it safely and gradually week by week.

A coaching cue is a short, clear verbal instruction a trainer gives during an exercise to correct or reinforce proper technique in real time, without stopping the movement entirely. Examples include "chest up," "brace your core," or "drive through your heels." Cues are deliberately brief because a client is actively performing a physical movement and cannot process a long explanation in the moment — the goal is to trigger an immediate, specific adjustment. Learning a repertoire of clear, commonly used English cues is one of the most practical communication skills a personal trainer develops, since imprecise or confusing cues can lead to poor form and increased injury risk.

"Push-up" and "press-up" refer to exactly the same bodyweight exercise — lowering and raising the body from a plank position using the arms — but reflect a regional vocabulary difference. "Push-up" is the standard American English term, while "press-up" is more common in British English. Both terms are widely understood internationally in fitness contexts, and English-language fitness content from different countries may use either term interchangeably, so it is useful for learners to recognise both rather than assuming only one is correct.

RPE stands for Rate of Perceived Exertion, a scale (commonly 1-10, sometimes 1-20 on the older Borg scale) that a client uses to self-report how difficult an exercise or set feels, independent of the actual weight or speed involved. An RPE of 5 might feel moderately challenging, while an RPE of 9-10 feels close to maximum effort. Trainers use RPE alongside or instead of fixed percentages of a client's one-rep max, because it accounts for daily variation in energy, sleep, and stress — allowing training intensity to be adjusted based on how a client actually feels that day, not just a number on paper.

These are three distinct muscle groups in the lower body that trainers refer to constantly when explaining exercises. The "quadriceps" (quads) are the muscles on the front of the thigh, primarily responsible for extending the knee, and are heavily engaged in squats and lunges. The "hamstrings" are the muscles on the back of the thigh, responsible for bending the knee and extending the hip, and are targeted by exercises like deadlifts and leg curls. The "glutes" (gluteal muscles) form the buttocks and are the primary hip-extension muscles, worked significantly by squats, deadlifts, and hip thrusts. Trainers use this vocabulary to explain which exercises target which areas of the body.

"Brace your core" is a common cue instructing a client to actively tighten their abdominal and lower back muscles, as if preparing to be punched in the stomach, creating stability around the spine before and during a lift. This is distinct from simply "sucking in" the stomach, which does not provide the same protective rigidity. Trainers use this cue especially before exercises like deadlifts, squats, and overhead presses, where a stable, braced core protects the lower back from excessive strain under load. Understanding and correctly executing this cue is considered a foundational safety skill in strength training.

A superset is a training technique in which two exercises are performed back-to-back with no rest period between them, only resting after completing both. Supersets are used for several reasons: to save time during a session by keeping the heart rate elevated, to work opposing muscle groups efficiently (for example, pairing a bicep exercise with a tricep exercise), or to increase the overall intensity and fatigue of a workout. English-language training programmes describe supersets using notation like "A1/A2," indicating the two exercises are performed as a paired set rather than in strict sequence with full rest between each.

Common check-in phrases include "How does that feel?" (asking about comfort or difficulty), "Is this a good weight for you?" (assessing whether the resistance is appropriate), "Any pain, or just muscle fatigue?" (distinguishing normal exercise discomfort from potential injury — an important safety distinction in English fitness vocabulary), and "Do you need a break?" (offering rest before pushing further). These phrases reflect the collaborative, safety-focused communication style expected in professional English-language personal training, where a trainer continuously monitors a client's physical and verbal feedback rather than simply issuing instructions one-way.

English-language fitness and safety training draws a deliberate distinction between "discomfort" — the normal, expected burning or fatigue sensation of challenging muscles during exercise — and "pain," particularly sharp, sudden, or joint-related pain, which can signal injury risk and should stop the exercise immediately. Trainers are taught to ask clients specifically "is that a muscle burn or sharp pain?" to clarify which sensation is occurring, since clients without fitness vocabulary sometimes use "pain" loosely to describe ordinary muscular effort. Teaching clients this vocabulary distinction is considered an important safety practice in professional personal training.