He is doing exercises to strengthen his genioglossus muscle.

He is doing special exercises to strengthen his mentalis muscle.

The geniohyoid muscle is a muscle located under the jaw.

He stuck out his tongue and licked the ice cream.

This festival is held every year.

In order to succeed in this project, it is necessary to strengthen teamwork.

We hold meetings every week to strengthen teamwork.

He goes to the gym every day to build his physical strength.

He is doing special exercises to strengthen his tongue muscle.

He is my best friend.