He started training his anal sphincter.

He is researching about the sphincter in the digestive system.

I do strength training every day.

The anal sphincter is an important part of the body.

The internal anal sphincter is a muscle that helps us control defecation.

This soap has antibacterial effects.

I decided to start a new project.

He came to Japan for the first time.

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

He started playing the piano.