Bigu, also known as "Quegu", "Broken Valley", "No Valley", "No Valley" and "No Valley", does not eat grains, eats gas and absorbs natural energy. In the past, Taoism was considered as a method of cultivating immortals, but now it is a health care teacher who uses energy to cultivate body and mind. People eat whole grains, and feces accumulate in the intestines to produce foul smell; At the same time, Taoism believes that it is necessary to remove the dirty gas in the intestine and remove the three corpse worms. Therefore, Taoism imitates the immortal behavior described in "Zhuangzi Xiaoyao Tour", hoping to achieve the goal of becoming immortal. Modern people are rich in food, and it's good to eat too much. Going through the valley is for health, detoxification, beauty, beauty, body conditioning and getting rid of sub-health.

The origin of "the ancient art of pig's pestle" [1] began in the pre-Qin period, about the same time as "the art of promoting qi". The collection of etiquette works before Qin and Han Dynasties, The Core Monument of Yi Ming, said: "Carnivores are brave, food eaters are clever, gas eaters die as gods, and non-eaters die as gods." It is the earliest theoretical basis of the art of crossing the valley. There are similar records in Huainanzi Dizhi. There are also examples in The World. For example, in the Spring and Autumn Period, there was a lone leopard in the State of Lu, who lived in the mountains and drank streams. "I don't wear silk and hemp, I don't eat whole grains [2], and I still wear the color of a boy." He is the earliest practitioner of breaking the valley recorded in Historical Records. In 1973, among the silk books unearthed from Mawangdui Han Tomb in Changsha, there is an article "Going to the Valley to Eat Qi", which is the earliest extant work before the Han Dynasty. There is a cloud: "Those who go to the valley eat pyrrosia. If you are heavy-headed, light-footed, and clumsy, you will be smashed (fried), depending on the benefit. " It means that when you first arrive in the valley, you often have top-heavy hunger, which must be overcome by "blowing". Here, the combination of Bi Gu and Hodge, like the deliberate combination of Hodge and Dao in Zhuangzi, seems to indicate the initial existence of these three technologies in the pre-Qin period, that is, their simultaneous appearance.