Relax and lie flat on the ground. Keep your knees straight and close together, and slowly lift your legs until they are at 90 degrees to your body. After holding 10 seconds, slowly put it down. This action is repeated 15-20 times a day.

Lie flat on the ground with your head and shoulders on the ground. Put your knees together, slowly lift your body to your shoulders and leave the ground, and touch your right knee with your left hand. Then, when you lift your body again, touch your left knee with your right hand. This action is repeated 10- 15 times a day.