1, stand against the wall: back to back with the wall, pay attention to three points to stick to the wall, one is the head, the other is the hip, and the third is the foot. These three points are completely close to the wall, hold your head up and hold your chest high. By the way, you should land on your toes for three minutes. It's easy
2, sit-ups: legs straight, the body is in a straight line, use the strength of the abdomen to slowly lift the upper body, about 45 degrees, but be sure to pay attention to the legs and feet must not move, be sure to stick to the bed or the ground. Do it 20 times! Abdominal sit-ups are particular.
3, air bike: after sitting sit-ups, don't rest, continue to exercise, lift your legs, do 90 degrees with the upper body, and then cross your legs in the air like riding a bike, do 50 times!
4. After finishing, stick your legs out as much as possible, so that the less your body touches the bed and the ground, the better! It is best to only support it with your head and shoulders for 3-5 minutes.