As Danielle Olson called it, the psoas major muscle (pronounced “so-as”) is the “muscle of the soul.” This muscle is located close to the hip bone, and it stabilizes the core, influences flexibility, mobility, the function of the joints, structural balance, and much more.
This muscle supports the upright posture of the body, and when stretched out, it helps you to relate to the present moment by releasing the tension.
Researchers have found that it is extremely important for the psychological wellbeing. The author of The Psoas Book, Liz Koch, says that it “literally embodies our deepest urge for survival, and more profoundly, our elemental desire to flourish.”
It is the main muscle linked to the physical stability and is the only muscle which connects the spinal column and the legs.
It stretches from the legs to the spine, in fact, from the T12 vertebrae, goes down the five lumbar vertebrae, and attaches to the top of the thigh bone.
It is also connected to the diaphragm, which modulates breathing, and is also the location of numerous physical symptoms linked to fear and anxiety.
This is a result of the connection between this muscle and the most ancient part of our brain stem and spinal cord, known as the reptilian brain.
Koch adds “Long before the spoken word or the organizing capacity of the cortex developed, the reptilian brain, known for its survival instincts, maintained our essential core functioning.”