It is suggested to look for thin-bellied calisthenics online or in Weibo and APP, such as flat support, touching knees, touching feet, scissor legs, left and right belly rolling, flat stretching abdomen, flat alternating touching shoulders, etc. All these can be done in thin belly. You can find a small video to try. It's good. After all, exercise is a good way to lose fat healthily. At first, it will make your abdomen and waist ache. Just practice often. I hope I can help you!