It varies from exercise to exercise. Sometimes two sets, sometimes three. The number of reps varies, also (8, 12, 15). Sets and reps seem based on relative level of difficulty. She has one move (the slow 4-count lunge) of which she only does four reps for each leg. On that one, I've never been able to do all four. Once, I did 3 for each leg, without added weight, but if I give it my all I really can't do more than two on the first leg or I'll have no energy to do the same amount on the second leg. Tough, tough, tough.