The iliopsoas muscle is the major flexor of your hip joint. It’s made up of two muscles: the iliacus, the psoas major. These muscles work together to flex your hip, as well as stabilize your hip and ...

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 ...

Tight hip flexors, especially a deep muscle called the psoas, can silently stress your spine. Here's why this muscle deserves more attention—and how to strengthen it. Lower back pain is often blamed ...