There are five short vowels in Japanese.

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

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

He underwent surgery due to an injury to his extensor pollicis brevis.

He had difficulty walking due to an injury to his extensor hallucis brevis.

I go to the gym every day to build my muscles.

This river is three long.

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

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

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