Slimming is actually very simple, the important thing is to stick to it! Do an hour of sit-ups in the dormitory every day, do 30 at a time, rub your stomach, and then continue to do it. Do five groups a day, and you can increase the amount after one week (don't do so much at first, otherwise your stomach hurts). Exercise is the best way to lose weight and will not rebound. When doing sit-ups, you can sit while singing, you won't feel bored, and you can also exercise your singing lung capacity. You can also find someone to supervise you and keep you going. However, I want to advise you, don't shake the hula hoop thin belly, it will rebound sharply, remember!