He is doing special exercises to strengthen his adductors.

His son was born with clubfoot.

He is doing special exercises to strengthen his pronator.

He underwent surgery on his intraocular muscle.

He is doing a special exercise to strengthen his internal intercostal muscles.

The internal obturator muscle is part of the pelvic muscles and is mainly involved in stabilizing the hip joint.

The internal anal sphincter is a muscle that helps us control defecation.

The internal urethral sphincter plays a crucial role in controlling the flow of urine.

He turned thirty years old.

This picture is fixed to the frame.