What is the best rep range to use for muscle building? Well, what I am about to say might surprise you: There is no magical rep range. There are reasonable ranges, but at the end of the day as long as you aren't trying to turn weight training into an aerobic activity, most rep ranges between 5 and 12 (even up to 20) will assist you with muscle building if they are used wisely.One thing you learn working with top level bodybuilders and powerlifters on a daily basis is the reality that no two athletes train alike. Some train with lower rep schemes, some train with a variety of rep ranges, and a few even train with very high reps. Chet Yorton, who defeated Arnold Schwarzenegger at the 1966 NABBA Mr. Universe, is known for using a system of training that focused on 22 rep sets. On the other hand, Arnold relied heavily on Reg Park style 5x5 workouts as a younger bodybuilder.So here we have the paradigm that baffles most trainees...Chet Yorton used 22 rep sets, Arnold Schwarzenegger used 5 r...