Looking at individual muscles… their origins, insertions, and actions… is a great way to study anatomy… but,

if you want to understand movement you really need to understand muscles in their relationships to other muscles… and even more important, their relationship, to other connective tissue…

As Thomas Meyers has pointed out, our children will understand movement in a completely different way from the way we learned it.

Today, we can group muscles as Spring Systems (Dalton), Global Muscle Systems (Lee), Functional Lines (Meyers), and Chain Reactions (Janda).