He is doing special exercises to strengthen his platysma.

She was massaging her nape.

He is doing special exercises to strengthen his cervical muscles.

I strained a muscle at the gym yesterday.

He exercises his vastus lateralis muscle at the gym every day.

He is doing a special exercise to strengthen his vastus intermedius muscle.

He is doing special exercises to strengthen his vastus medialis muscle.

The rotator cervicis is an important muscle for turning the neck left and right.

The longissimus cervicis muscle is a part of the neck muscles, helping to pull the head back.

He has hurt his neck.