1. Lie on your back on the bed, stick your head out of the edge of the bed, then slowly lift it and then put it down. Repeat 10 times. 2. Without moving your shoulders, just stretch your neck forward as far as possible for 6 seconds, then put your chin as close to your neck as possible, keep this action for 6 seconds, then relax and repeat it many times. 3. sticking out your tongue can keep the skin between your chin and neck tense.