He is doing special exercises to strengthen his flexor pollicis longus.

He is doing special exercises to strengthen his flexor hallucis brevis.

He started a special exercise to strengthen his flexor hallucis longus.

He is doing a special exercise to strengthen his flexor carpi ulnaris.

The flexor carpi radialis is an important muscle for bending the wrist.

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.