Lie on your back and draw your legs to practice abdominal muscles
Bend your arms and place your palms on the ground so that your upper body and the ground form an angle of about 60°.
Tighten your abdomen and lift your legs off the ground (only your buttocks are on the ground).
Use your abdominal muscles and bend your legs toward your chest.
Slowly straighten your legs, return to the original position and repeat.
Note that you should move quickly when retracting your legs and as slowly as possible when extending your legs, and your legs should not touch the ground during the entire process.
Ideal number of groups: 20/group, do 2 groups.