1. First, find a flat place and lay your body flat, as shown in the following figure:
2. Then put your feet up and put your hands on your thighs, as shown in the figure below:
3. Then use your abdomen to push your body forward like legs and knees, as shown in the following figure:
4. Lie back a little after touching your knees. At this time, you can't lie down directly and let your abdomen be in a state of exertion, as shown in the following figure:
5. After that, the abdominal muscles will push forward to the knees again, and this group of actions can be repeated according to the number of actions set by individual physical strength.