Primitive energy, also known as neutral qi, is also the fundamental qi of human beings. Generally speaking, people's major surgery and caesarean section will cause. The toxic gas leaked, and it will take a long time to recover. All the five zang-organs have essence, which actually refers to the unique functions of the five zang-organs, but the kidney is the organ that really stores essence. This essence is divided into narrow sense and broad sense. In a narrow sense, it also refers to reproduction and tangible essence. Broadly speaking, it is the invisible essence all over the body. The essence of spleen and stomach is actually the subtle Shui Gu of transportation. Blood is stored in the liver, and the blood is unobstructed, indicating that the essence is normal. Similarly, the lung governs propaganda and absorption. When it comes to maintenance, it will also involve the problem of five elements, which is actually the problem of health preservation. Comply with nature, live a moderate life, live a regular life, rest and relax, and develop good living habits, which will naturally lead to health and longevity.