Most of us know the names and location of the major muscles, and what role they play. No one’s giving me points for knowing the whereabouts of my pectorals or quadriceps, but when my editor tasked me with doing the psoas march every day for a week, my first thought was, “Well, I know what marching is, so I’m halfway there, and the psoas is the muscle that’s… down there… in the back… somewhere. It does… stuff.”
I was very loosely correct. But I had no idea how much “stuff” it does and how little attention it gets. The psoas really matters.
