What Are The Hip Flexors? Located between your upper body, and your lower body is your pelvis, it is here you will find your hip flexors, a group of muscles that run through your pelvis attached in and around your hips. Together they assist you to walk, kick, bend, swivel your hips and stabilize your spine. The main muscle sitting within the well of your hip and lower spine is the psoas (pronounced so-az) muscle.The psoas is the only muscle in the human body connecting the upper body to the lower body. The function of the psoas muscle is to create a neutral pelvic alignment, stabilise your hips, support your lower spine, support your abdomen, support the organs in the pelvic and abdominal cavity and to enable mobility and core strength. The muscle attaches to the vertebrae of the lower spine, moves through the pelvis and connects to a tendon at the top of the femur. It also attaches to the diaphragm, so it’s connected to your breathing, and upon it sits all the major organs. When the ...