The psoas major muscle (pronounced "so-as") is often referred to as the deepest core, or as yoga therapist and film-maker Danielle Olson states, the "muscle of the soul." This core-stabilizing muscle located near the hip bone affects mobility,.
Are your tight hips putting a cramp in your lifestyle? Tight hips can lead to back pain and sciatica, and prevent you from doing activities that you enjoy. Try these 13 feel-good hip openers to loosen (Fitness For Beginners Venus Factor)