" when the round/rest starts and finishes.Also there is a sound that marks the end and start of the round/rest.-The reps workout type work by pressing Done on the bottom of the exercise,and when you want to start the exercise to to press begin.The exercises contain 48 exercises that will show the muscle group that it targets.Major muscle groups that the workouts hit:- Abdominals- Back- Biceps- Cal" . . . .