He is doing a special exercise to strengthen his internal intercostal muscles.

He is doing special exercises to strengthen his intercostal muscles.

She was hiding the sadness concealed within her smile.

He will succeed sooner or later.

He works at the blacksmith's every day to forge his skills.

He is working out his muscles at the gym every day.

This festival is held every year.

He injured his intercostal during a soccer match.

The external intercostal muscle plays an important role in respiration.

I strained a muscle at the gym yesterday.