1. Cycling: Lie on your back, bend your elbows with your hands and hold your head. Lift the upper body with the strength of the waist and abdomen, separate from the ground and try to be perpendicular to the ground. Then cross and push up, just like pedaling a bicycle hard. After about five minutes, your abdomen will start to get hot and even cramp. At this time, take a break for about three minutes and make another one.

2. Sit-ups: This is the most common exercise in life. Many people exercise the vest line through this exercise, but in fact, sit-ups will achieve a better effect of thin abdomen. You also need to lie on your back on the ground with your legs together, then bend your elbows with two azole hands to hold your head, and then lift your upper body through the strength of your waist and abdomen, and separate it from the ground by about 60 degrees. This action lasts about 15 seconds.

3. Bending exercise of fitness ball: lean your lower back on the fitness ball, then put your hands on your chest, and lift your upper body with the strength of your waist and abdomen to make it leave the sphere. Be sure to pay attention to safety, keep the balance of the ball well, avoid the instability of the ball, and leave the sphere with brute force, otherwise it will easily fall and the risk will be incalculable. Therefore, it is necessary to do bending exercise under the premise of safety.