1. Touch your toes on the bed with both hands (lift your body), and be sure to do it slowly. If it is fast, there will be inertia, which will affect the effect. Be sure to do it to the end and do it in place.

2. Sit-ups can also be used in bed. Lift your upper body slowly and tuck in your abdomen. Keep your head as close to your knees as possible. When leaning backwards, the back touches the board. For people with a sports foundation, it is best to do it on the inclined plate and abdominal muscle frame, which can fully lean back and increase the difficulty of abdomen.

3. Lie flat on the bed with your feet together, lift it 90 degrees, put it down and lift it again.