- - sets sets - - sets sets Chest - - sets The rep range for muscle building is - reps per set and you should be lifting with a weight that you struggle to complete the last couple of reps on each set with good form. Khi bạn đánh dấu rep với định dạng good. If you are under the age ofand looking for training advice visit the Muscle and Strength forum where you can find articles and routines specific to teenage trainers.