At this time, when the Yin Qi of heaven and earth gradually disappeared and the Yang Qi began to grow, Zishi is also called the winter solstice in the big and small Zhoutian skill of the Neidan sect, which means the time to start a fire.

Su Chan clearly remembered that he had recited the classic book of practice "like Sutra and figure wings" before and said, "at the beginning of Yang's birth."

For beginners like Li Yundong, it is very important to practice in Zishi, that is, the winter solstice.

At this time, the most effective way to practice is to get twice the result with half the effort. As long as an ordinary practitioner carries out one or two hours of practice, he will be energetic and not feel tired in one day.

If we can develop the Kung Fu of automatic cultivation at this time, then this person's cultivation will be able to reach a higher level and reach the "returning Dan and restoring life chapter" which says: "there is no need to find the winter solstice to practice Dan, and there is a Yang in the body".

That is to say, people at this time don't have to practice at Zishi. There is the purest Yuanyang Qi in heaven and earth. They can practice whenever they want.

This state means that a person's small Zhou Tian practice has basically had a foundation, and can begin to enter a deeper level of large Zhou Tian practice.

The human body has eight extraordinary meridians. Xiaozhoutian practices the Ren and Du Meridians of the human body, while dazhoutian practices the remaining six Extraordinary Meridians of the human body, such as Chong meridians, Dai meridians, Yin dimensional meridians, Yang dimensional meridians, Yin Qiao meridians and Yang Qiao meridians, as well as the twelve meridians of foot Shaoyin kidney meridians of hands and feet.

In other words, by cultivating these meridians, people can exercise the "Qi coagulation" of gathering breath at will and the "freedom" of using breath at will.

Once the three courses of "expanding Sutra", "Qi coagulation" and "freedom" are completed, it marks that Li Yundong will break through the intermediate level of the second heaven of "Qi refining" and begin to move towards the advanced level.

Su Chan uses massage to help Li Yundong mobilize his strength. Although it is not in Zishi, it is now Mao Shi, which is the most vital period of Yang Qi between heaven and earth, and he can barely make do with it.

Li Yundong only felt that this time his whole body felt different from the last time. Last time, he only felt comfortable all over, limited to flesh and meridians.

But this time, Li Yundong felt that his lower abdomen Dantian was like a fire, his waist and kidneys were like boiling water rolling in his bones, like cooking soup. Although he closed his eyes, he could still feel that there was golden light in front of him, and this golden light was not shot in from the outside, but sprayed out from his eyes!

Not only that, Li Yundong also felt the sound behind his ears, like wind behind his ears. Behind his head, there were bursts of calls similar to the sound of vultures. Up and down his body, it seemed that waves were constantly surging from Dantian to his head. Every time the waves were rough, his sinuses twitched, full of rhythm.

Li Yundong was in a mess. The immortal wanted to die, but Su Chan was too nervous to blink. Her figure wandered back and forth in front of and behind Li Yundong. Her fingers flew on Li Yundong's front, back, hands and feet. Her five fingers flew like a butterfly wearing flowers. She was almost a remnant.