He started training his anal sphincter.

He is researching about the sphincter in the digestive system.

This soap has antibacterial effects.

I do strength training every day.

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

The anal sphincter is an important part of the body.

I train at the gym every day.

I do training every day without fail.

I decided to start a new project.

He started playing the piano.