Getting through the second pulse of Ren Du is also called Zhou Xiao Tiangong. Heavenly cultivation in Zhou Xiao. You can stand, sit or lie down. When the Five Qi in Dantian turns from left to right, use your mind to guide the Qi head into Changqiang point (the starting point of the Du meridian is between the coccyx and anus) and move straight up along the direction of the Du meridian. There are three difficulties in the process of opening Du meridian, one is caudal point (on the posterior median line of the body, at the end of coccyx sacrum), and the other is Jiaji point (on the posterior median line, opposite to the point). The third is the Jade Pillow Point (the occipital part where the skull is connected with the cervical vertebra, also called the iron wall). These three acupoints are the most difficult to get through. When you first start practicing the "last three levels", you often can't rush, so you should be in a hurry. You can return the gas head to Xiadantian for gas gathering, and then return to the pass after the rotation is accelerated, and so on. After a long time, the work will naturally pass. After the gas head passes through three passes, it can stop at the gingival intersection (the termination point of the Du meridian, which is sewn on the upper teeth in the mouth) and return to Xiadantian along the Du meridian. When the qi head passes through the Du meridian, you can start to open the Ren meridian. The method is as follows: After the five qi are transferred, lead the qi head to Yin Hui point (the starting point of ren mai) to ascend ren mai, and there are also three barriers to open ren mai. First, Guanyuan point (three inches below the navel); The second is Zhongshan point (the gap between the flat branches and concave ribs on the median line in front of the body, also known as Zhongdiantian); The third is Tang Yindian (also called the porch and Tianmu). This Sandao Pass is called "the former Sandao Pass", which is often difficult to pass in the initial training. You can return the gas head to Xiadantian along the meridians, and then return to the customs after the gas production accelerates. After the three passes, Tongtou will stop at Chengjiang point (the termination point of Renmai). After the gas head runs smoothly in Ren meridian, it can cross the bridge into Du meridian or cross the bridge from Du meridian into Ren meridian. The so-called "crossing the bridge" refers to the transition of the gas head from the intersection of gums to the tip of the tongue through Jinjin and Yu Ye points (at the base of the tongue), and then from the tip of the tongue to the pith point. Or from Chengjiang point to the tip of the tongue, through Jinjin and Yu Ye points into the intersection of gums. After successfully crossing the bridge, Qitou can circulate along Ren meridian against Du meridian for three weeks, and then along Du meridian against Ren meridian for three weeks. Doing this three times is a small Sunday. Someone once said, "The first three levels, the last three levels, and after three levels, are like immortals". It can be seen that the role of Xiao Sunday can not be underestimated. Xiao Sunday's song decision is as follows: The original intention is to attract Qi Dan to break through the three levels, and the first three and the last three are transformed into yin and yang. For three or two weeks, the pulse is smooth and the life is prolonged like a fairy.