Leg exercise: put the baby in prone position, with parents behind the child, hold his wrist with both hands, help the baby kneel down, and then help him stand up straight. Repeat it twice. It should be noted that when the baby kneels straight, he should try to stand up by himself.

2 sit-ups: let the baby lie on his back, hold the baby's wrist with both hands, pull the child to sit up, and then restore it and do it twice in a row.