He started exercises to strengthen his sternocleidomastoid muscle.

This fossil has very well-preserved mammary tubercles.

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

He exercises his pectoral muscles every day.

I decided to start a new project.

Since I started studying Japanese, I have been able to understand more about Japanese culture.

He came to Japan for the first time.

He started playing the piano.

He put his hand on his chest and swore.

I strained a muscle at the gym yesterday.