When it comes to building muscle, hypertrophy doesn’t just happen on its own. It has to be triggered by a physiological need.

Arnold Schwarzenegger does a 360-rep finisher and calisthenics warriors go until they drop—but how many reps are actually ...

Knowing how to build muscle and how long it should take to see results isn't a mystery. Here's what you need to know about hypertrophy and programming.