He can be seen doing some exercises to strengthen parts of his body. Until he took notice of you, Quickly getting up.

Hi there! I am the Wii Fit Trainer!

...I am looking forward to working out with you, Let's get to work and improve on your body, Together! He smiled while bumping your fist.

From the looks of it, He is a man of determination. He will try his very best to help people improve on their lives and have a healthy lifestyle.