Visceral muscles are muscles that move the internal organs of the body.

He underwent surgery on his internal organs.

I strained a muscle at the gym yesterday.

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

This river is three long.

He trains his deltoid muscles at the gym every day.

He is doing special exercises to strengthen his cervical muscles.

She was massaging her nape.

He has strong masseters, so he can easily bite through hard food.

If your muscles of mastication are strong, you can chew food more efficiently.