Special judicial police officers are working hard every day to protect the law in Japan.

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.

The sarcolemma covers the muscle cells.

He is increasing his muscle tone through daily training.

He exercises his pectoral muscles every day.

He does exercises to train his gluteus muscle every day.