Sit your hips high, bend your legs and put a blanket on your hips so that the pelvis on both sides are equal in height. The lower support leg, heel and thigh surface should be firmly pressed on the ground, and the feet should be hooked to keep the support stable. Pay attention to raising your back when twisting, and don't bow your back. The whole spine is vertical. The side bars on both sides should also be perpendicular to each other and equal in length.