Everything on the top floor is wrong. Sit-ups are the most useful exercise to reduce stomach, but there is one trick: only do six sit-ups a minute, touch your ears with your hands, and keep your lower body still. When your upper body rises to 45 degrees, keep still for more than 5 seconds, then sit up completely and do it 30 times a day. There is a model whose abdomen is super sexy. She does 500 sit-ups every day. Don't do so much, just do as much as you can.

If you don't want to suffer, it's hard to use other methods to thin belly, such as belly dancing. You need to warm up for 30 minutes first, and then do belly dancing for more than 10 minutes (I feel uncomfortable just learning).

By the way, there is another living habit to be changed: you must walk for half an hour to an hour after three meals, and never watch TV or sleep, because this half an hour is the time for your little belly to gain weight.