Q: It’s hard for me to believe that a few partial reps at the end of a set [a.k.a. X Reps] can do anything measurable for muscle gains. Isn’t doing an additional set just as good or better for muscle growth?

A: At first glance, you’d think so; however, once you understand muscle physiology, you see the enormous muscle-building effects that can occur if you extend a set correctly. It all starts with the size principle of muscle fiber recruitment…

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