He is all muscles, just like a meathead.

She exercises her facial muscles every day to keep her face youthful.

He is doing special exercises to train his teres major muscle.

He goes to the gym every day to train his rectus muscle.

He is training his brachialis muscle every day.

He stretches his flexors every day.

He is doing special exercises to strengthen his tongue muscle.

He is training his oblique muscles at the gym every day.

He goes to the gym every day to train his tensor.

He is training every day to strengthen his constrictor muscles.