Bend down and lie flat on the mat, and naturally put your hands on your sides. Lift your legs, your thighs are at 90 degrees to the horizon, and your calves are at 90 degrees to your thighs. Use the strength of the lower abdomen and thighs to lower the legs in turn and then hang them. Don't touch the ground when your legs are down. The downward hanging of one leg is 1 8 beat, with 8 8 beats each time.