He is doing special exercises to strengthen his iliopsoas muscle.

He exercises every day to strengthen his psoas muscle.

I strained a muscle at the gym yesterday.

He went to the hospital because of a problem with his large intestines.

He was dancing, swinging his hips.

She was dancing, swaying her hips.

By strengthening the rotator lumborum, you can prevent lower back pain.

He is doing special exercises to strengthen his psoas major muscle.

The iliocostalis muscle is part of the muscles in the back, playing a role in supporting the body.

He is doing special exercises to strengthen his iliacus muscle.