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, structural balance, joint function, flexibility, and much more. In addition to its function to help keep the body upright and moving, the psoas is believed to allow you to connect with the present moment especially when it is stretched out and tension is released from the body.
Research indicates that the psoas is vital to our psychological wellbeing in addition to structural health. Liz Koch, author of The Psoas Book, states that our psoas “literally embodies our deepest urge for survival, and more profoundly, our elemental desire to flourish.” This means that there is a lot more to the psoas than one might initially think. It is entirely possible to harness healing pranic energy and improve mental health by keeping the psoas healthy.
Where is the Psoas?
The psoas is the principal muscle associated with physical stability. It stretches from the legs to the spine and is the only muscle connecting the legs to the spinal column. The muscle flares out from the T12 vertebrae, follows down the five lumbar vertebrae, before attaching to the top of the thigh bone.
The Reptilian Connection
In addition to connecting the legs and spine, the psoas is connected to the diaphragm. Breathing is modulated at the diaphragm, and it is also the location where many physical symptoms associated with fear and anxiety manifest. Koch believes that this is due to the direct link between the psoas and the most ancient part of our brain stem and spinal cord, called the reptilian brain.
According to Koch, “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.” The way we live today, constantly rushing, competing and achieving, has the psoas in a constant “fight or flight” state.