Kicking on your back: Lie on your back on the bed, knee pads with your legs together, and hands on your waist. Push the leg down alternately with the strength of the leg, and practice this action repeatedly until the leg feels tired. 2, leg lifts push-ups: prone on the bed, legs together straight, arms straight to support the body. Slowly press down the upper body with the strength of the body and lift the calf at the same time. When reaching the limit, keep this posture for a while, then slowly return to the original posture and practice repeatedly until the body feels tired. 3, lying flat and twisting: lying on the bed, arms open to shoulder height, legs together, keep your knees bent. Twist your legs to the left with the strength of your legs until you are flat on the bed. After maintaining this posture for a period of time, slowly return to the original posture, and then turn the force to the other side with your legs. 4, supine leg lifts: lying on the bed on your back, hands on your waist, legs together to keep your knees bent and your feet touching the ground. Use the strength of the leg to lift the left leg upward, and at the same time straighten your arms and pull your leg up. When it reaches the limit, keep this posture for a while, then slowly return to the original posture and change your right leg to practice the above exercises.