He is suffering from muscle pain in his gemellus muscle.

He is doing special exercises to strengthen his intercostal muscles.

He is doing special exercises to strengthen his mentalis muscle.

He is doing special exercises to strengthen his caninus muscle.

I like memorizing the Hyakunin Isshu.

It's difficult to memorize the Hyakunin Isshu.

He is doing special exercises to strengthen his tensor fasciae latae.

Ogura Hyakunin Isshu is one of the classical literatures of Japan.

He trains his biceps at the gym every day.

He does piriformis muscle stretches every day.