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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 ...

Most of us know the names and location of the major muscles, and what role they play. No one’s giving me points for knowing the whereabouts of my pectorals or quadriceps, but when my editor tasked me ...