RepetitionRep · Reps

A repetition is a single execution of an exercise: one squat, one press, one curl. It runs through a lowering phase and a lifting phase, and the count of reps in a row makes up a set.

It matters because rep count is the simplest lever you have on what a set trains. Very low reps with heavy loads bias towards maximal strength; moderate reps in the region of six to fifteen are the usual home of hypertrophy work; high reps with light loads bias towards muscular endurance. The boundaries are blurry, and how close you take the set to failure matters at least as much as the number.

In practice, counting reps is also how progressive overload gets recorded. Adding a rep at the same weight is a real, measurable improvement, and for most people it is a more available form of progress than adding load every session.