Method 1: Sit-ups A: Lie flat, cross your legs and put your hands behind your head, just like preparing for sit-ups. B: Take the lower abdomen as the midpoint, lift the upper body, and at the same time retract your feet forward until your elbows touch your feet. This posture looks like crouching, so your mind should focus on your lower abdomen. C: Return to the original posture and repeat the above steps for 30 times. Don't underestimate this. If you don't do it for ten, you will have a little abdominal pain. You sweat after doing thirty. Method 2: Ride a bike. Answer: Lie flat with your legs bent at 45 degrees. B: Your legs extend and retract alternately. This posture is like the movement of your feet when riding a bicycle. C: Take a step forward and keep your feet off the ground for about 30-60 degrees. Hold for 5 minutes. This method can exercise your thighs, waist and abdomen. In other words, these three places can lose more fat. Method 3: A: Sit up straight, put your feet together and straighten forward. Put your hands behind your head. B: lean back, raise your legs together and straighten them. The body is V-shaped. C: Keep the action 10 second, and repeat the above action 10 times.