To practice this skill, you only need to prepare two chairs. Practice method: two chairs should be placed at the distance from shoulder to heel. Practitioners lie face up on two chairs, with their heels on one chair and their shoulders on the other. The middle part of his body is suspended, so that he can maintain an upright posture when standing, and he must not sink. At the same time, sniff and inhale, and harmonize qi and blood. It means that a beam of red light enters the body from Baihui point on the top of the head, turns into heat flow (red or golden yellow), slowly flows to the bones of limbs, and finally gathers in Dantian.