The number of excercises that you perform in a row without a break is called?
groups
rest
set
repetitions

The number of exercises that you perform in a row without a break is called sets.

Explanation:

The term ‘set’ is used in exercises to define the number of time it takes to work out or to exercise. A similar term is ‘reps’ is also use to refer to the time span of an exercise in particular.

However, sets refer to the amount of reps cycle that one finish. It is the numeric amount of reps- for example; a 16 rep of squat means ‘one set’ of 16 reps.