10/15/2026
It’s deep in horses and humans. In humans it is the deepest anterior muscle. That’s hard to grasp. The psoas connects the pelvis to the thigh bone and its main purpose is to flex the hip as in marching.
Unfortunately with all the sitting we do these days, I see people using it to stabilize the pelvis ( hence low back pain).
Learning to release the psoas and building your core to support your low back is something I teach most of my equestrian clients.