The Psoas muscle is the deepest muscle in our body and runs from the mid-back to the inner thigh connecting our spine to our legs and it plays a role in the external rotation of the leg (it lifts the thigh as you walk) it is a muscle that extends and flexes the lower spine and allows the weight to be supported through the bones so that walking commences at the solar plexus rather than the hip joint and the knee. It is also connected to the diaphragm and other muscles of the u