The iliopsoas muscle is the major flexor of the hip joint, made up of the iliacus and psoas major muscles. Pain in the iliopsoas muscle can be caused by sitting too long, muscle imbalance, overuse, or ...

With weak glutes, the body must find other ways to propel itself forward. The hamstrings and the erector spinae (lower back muscles) are forced to overwork. This leads to chronic hamstring tightness ...