He is doing special exercises to strengthen his iliopsoas muscle.

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

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

I go to the gym every day to build my muscles.

This river is three long.

He trains his pectoralis major muscle at the gym every day.

He exercises his pectoralis minor muscle at the gym every day.

The rotator thoracis is one of the muscles that helps in the rotation of the body.

He is doing a special exercise to train his longissimus thoracis muscle.

His move was very fast.