Muscle Physiology

Whether it's for vanity or strength, we’re in the business of building muscle. It is therefore essential that we clearly understand how muscles work. Most people have only a shallow understanding of muscle function; they assume muscles are relevant only to bodybuilding and not a fundamental prerequisite for everyday movement.

Six hundred and fifty muscles govern the human body, and muscle action is a complex, coordinated process that involves growth, recruitment, lengthening and shortening. This module details every single component of a muscle and explains how those components interact to produce force, control movement and adapt to training.