1, lie at the end of the bed, keep it outside the bed below the hips, and then bend your knees so that your thighs are above your abdomen. Put your hands on your sides and palms under your hips. Next, you should tuck in your abdomen, straighten your legs forward at a speed of slowly counting to 10 to make your body in a straight line, then bend your knees at a speed of counting to 5 and return your thighs to their original positions. Pay attention to relax your back, shoulders and arms, and feel your stomach working.

2, arm sit-ups: lie down, bend your knees, feet together and hook the bed. Wrap a towel around your neck from behind and pull one end with each hand. Tuck in your abdomen, lift your shoulders, slowly roll up your back, then slowly lean back, and continue to get up when you touch the ground. Repeat.