He is doing a special exercise to train his longissimus thoracis muscle.

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

The epicranius muscle is one of the important muscles for making facial expressions.

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

He measured muscle activity using an electromyograph.

I examined muscle activity using an electromyogram.

Gidōsanshimō is a courtesy name of Takashina no Kishi.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

He did a somersault in the park.

He goes to the gym every day to train his biceps brachii muscle.