The key to losing your stomach is to exercise your stomach. You can try sit-ups, 20 at a time, 5 groups a day, and gradually increase the intensity. Remember to rub it gently when you sleep after exercise to avoid building abdominal muscles.

There are many choices for boys, such as barbells, sit-ups, and exercises for chest and back muscles. Just do it step by step, and at the same time increase the intake of protein and fat to ensure adequate energy.