The iliopsoas comprises the joined iliacus and psoas muscles. These hip muscles are the main muscles that help the hip to flex. A person can stretch these muscles, which often become stiff with ...

A shortened iliacus can also result from skipping out on stretching after strength training or, you guessed it, running. It’s important to keep the muscle both strong and supple – especially ...

the iliacus, the rectus femoris, the pectineus, and the sartorius. Together, these muscles support a wide range of movement. If you don’t strengthen or stretch them properly, they can become ...