Sitting with your back straight and shoulders down, tilt your head back so that you are looking at the ceiling. Forcefully press your tongue flat to the roof of your mouth. Then, keeping your tongue against the roof of your mouth, lower your chin to your chest as far as possible without rounding your upper back. You should feel your chin and the front of your neck contract. Then relax your tongue and straighten your neck to return to the starting position. That’s one rep. Complete two sets of 20 reps each.