Mike Mentzer: "Hitting The Muscle Growth Switch"

In this video Mike Mentzer reveals what it is about performing a set of repetitions that turns on the growth machinery inside a muscle, and how if you continue to perform tasks (reps) that are already well within your existing capacity, then your body has no reason to change the present size and strength of your muscles. It is the last seemingly impossible rep in a set that is the trigger mechanism that sets the growth process into motion.