I love this exceptional video and show it in my Releasing the Iliopsoas and Quadratus Lumborum courses. The Claude Bernard University University in Lyon, France has gifted the world with their fabulous array of anatomy videos. You can really go down the YouTube hole watching all of them!

There are some things I would add: the iliopsoas’s job as a stabilizer of the pelvis and low back; its role in centrating the head of the femur in the acetabulum; and that the upper psoas fibers create lumbar flexion while the lower fibers create lumbar extension.

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Check out my The Core of the Matter: Releasing the Iliopsoas and Quadratus Lumborum Online Course (24 NCTMB CE's) here