Concentration lies in nourishing qi, and nourishing qi lies in storing god. God is to the breath, and the mother is to the Son. Therefore, when the gods are condensed, the qi is concentrated, and when the gods are scattered, the qi is dissipated. If bao cherishes the essence and does not know the existence of God, it is Ru Qihua who forgets its roots. ——Yuan Huang, "Three Elements of Regents: Existence of God"
The human body is like an upside-down tree, the head is like a tree root, absorbing energy to nourish the limbs (branches and leaves).
If the human body is very simple from the perspective of modern anatomy, it is bones, muscles, blood vessels, blood, organs, etc.; from the perspective of traditional Chinese medicine, it is similar, that is, skin, flesh, muscles and bones, membranes, internal organs and qi and blood, so that it constitutes the body.

From a chemical point of view, the human body is lined up with a large number of atoms. But why does everyone look different? That is, the arrangement and combination of atoms in each person's body are different.
We look at the story of Nuwa", after Nuwa pinches the soil into human form, blows a breath, and the person lives. Mud is the earth and water together, this is some molecules, atoms, the ancients called this "dust". These dust and water, pinched, turned into small clay people. So the elements of the human body are water and earth.
Modern research has found that the elemental composition of the human body is very similar to the elemental composition ratio of the earth's crust, and the proportion of the element composition in human blood and the elemental composition of the sea water is also basically similar. Therefore Chinese always like to say that heaven and man correspond, and man is the descendant of nature.
But, after all, man is different from other substances in nature. So, what's the difference? The difference is that people are alive, moving every day, changing every moment, and are an open system, while tables and chairs are not.
That is, in addition to these elements mentioned above, the composition of the human body has energy and information. In the story, it is the breath that Nuwa blew out, the innate vitality. Without this breath, man is a clay man, without vitality.
In fact, the human body is like a tree, except that the roots of this tree are not on the ground, but on the head. The original energy of this tree comes from innate energy. We look at children, people in infancy, the Heavenly Spirit Cover (Fontanelle) is open, the so-called "Qi Nourishing Spirit Root Tranquility God", the spirit of infancy is idyllic and empty, then the spirit is sufficient, as if from the void (heaven) to absorb energy, the energy first makes the YuanShen brain full, and then fills the trunk, that is, ren dou er pulse and chong pulse, and then fills the limbs.
The human body's reneges arise from the perineum, which is the place between the anterior and posterior vulvas. The entire axis of the Ren pulse goes up from the middle of the anterior abdomen, to the lower palate, into the mouth, and then into the tongue.
Generally speaking, people with a bad mood, Ren Pulse is usually not passable, as long as the woman is in a bad mood, menstruation has problems, because menstruation is related to Ren Pulse. Ren Lord's Blood Sea, the Main Yin Vein's Sea, Ren's Pulse and Bloodline are connected. If our mood is depressed for a long time, ren pulse is particularly prone to tension, non-stretching, especially tightness and stiffness.
Ren's pulse walks through the chest and abdomen, connecting with the internal organs; the supervisor pulse goes backwards, connecting with the spine. The direction of the chakra is to go backwards from the perineal cavity, from the tail vertebrae section by section, all the way along the cervical vertebrae into the brain, into the Baihui, and then from the Baihui through the forehead to descend to the upper palate of the mouth.
The pulse is directly related to the health of the human body, if a person's pulse is unobstructed and the yang qi is sufficient, the person's life span is long. On the contrary, if a person's pulse is not clear, his life expectancy will be shortened, such as the elderly will have hunched over, scoliosis and so on. Moreover, if the pulse is not clear, the yang qi of the body will be reduced.
If a person has enough energy, he will go to the limbs to nourish his arms and legs. We look at the child, and when it's okay, he waves and kicks his feet, and the legs kick there, because the energy is sufficient and then naturally spreads out. This is just like the hands and feet itching when the vitality is abundant in the early days of practicing NeijiaQuan, and I always like to play something and kick something, indicating that the vitality is strong.
To use the metaphor of the previous tree, after the energy of the roots is sufficient, the trunk is first replenished, and then the branches are replenished. The root of the human body is the brain, that is, the Yuan God, the quieter the Yuan God, the more energy is sufficient, the so-called "idyllic nothingness, true qi from it." The Yuan God is abundant, and the true qi naturally flows abundantly, and then nourishes the rendu er vein (trunk) of the trunk, and then nourishes the limbs and hundreds of skeletons (branches). Therefore, the key to health maintenance is to nourish the gods, and the key to nourishing the gods is "idyllic nothingness and spiritual introspection".