According to the chapter "Miscellaneous Responses in Bao Puzi's Internal Chapter", there are ways to eat the Qi of twelve o'clock, the Qi of old stars, the Qi of six or five, and the Qi of thinking and thinking. Simply put, it is the Taoist breathing method and breathing method. Not many people really understood this thing in ancient times, and it has been lost and mythologized for a long time. Now it is estimated that few people know what it is. I suggest that the landlord be a mortal, and he can't cultivate immortality without practice, hehe.