He likes to take a walk in the park at dusk.

He is doing special exercises to train his serratus anterior muscle.

The serratus posterior superior muscle is one of the muscles that assist in the respiratory movements of the lungs.

We should always remember the power of Kannon in difficult times.

He started a special exercise to train his serratus posterior inferior muscle.

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.