A double chin, also known as submental fat, is a common cosmetic concern. Although having a double chin isn't harmful to your health, many people want to get rid of it for aesthetic reasons. There are several exercises you can do to help tone the muscles and reduce the appearance of a double chin. 1. Jaw releases Open your mouth wide and move your jaw up and down. 2. Neck rolls Slowly roll your head from side to side. 3. Kiss the ceiling Sit or stand with your back straight.