Rep/rep/ Definition 1 of 4Pro Tip 1/3Exercise Context Used in fitness, 'rep' relates to performing an exercise movement. Can you complete 10 reps of squats? Pro Tip 2/3Countable Reps 'Rep' is a countable unit in workouts, often combined with 'sets'. I'm aiming for 3 sets of 15 reps each. Pro Tip 3/3Workout Lingo In gyms, 'rep' is common lingo and understood universally among fitness enthusiasts. Your last rep was perfect form!