The so-called qi is actually qigong. In the article, Zhi Li thinks that Qi is the root of all things and the source of vitality. Qi is in people, from heaven and earth to everything, and you don't need to be angry when you are alive. Those who are good at qi are good at fitness inside and evil outside is good. "

Ge Hong gave a detailed explanation of the method of activating qi in the chapter of Jieyu. In other words, when you are angry, that is, from midnight to noon, you should practice step by step. At first, breathe in through your nose, spit through your mouth and breathe silently. If you can't hear, you should suck more and spit less, so it's useless to put a feather on your nose and mouth.

At the same time, try to extend the time from inhalation to exhalation. Beginners can count to 120 in their minds, then spit out a little and practice step by step until they can count to more than 1000. In the end, it can achieve fetal interest, that is, it can't breathe through the nose and mouth, as if the baby is in the womb, so as to reach the fairy road.

Ge Hong pointed out that there should be certain taboos in the operation of qi, such as eating enough and not eating lettuce and fat soup, otherwise the qi will be strong and difficult to collect, and at the same time, it is necessary to restrain anger to avoid confusion. Wait a minute.

Ge Hong linked Qigong with health preservation and advocated a quiet nothingness. Hang in there and cultivate the vitality of Tian Dan. He also advocated importing as an effective method to promote blood circulation and joint patency, and evolved a new qigong skill "turtle breathing method" on the basis of ancient qigong, which combined guidance with swallowing, exercised by imitating turtle's neck stretching and pitching movements, plus breathing and breathing, and the effect was obvious.

These theories and methods have played an important role in the development history of qigong and health preservation.