First, the abdominal brain is the body’s second brain Scientists believe that in addition to the human brain there is a “second brain”, that is, the abdomen. Many human sensations and perceptions are transmitted from the abdomen, which has a very complex neural network, and this “second brain” is also known as the “abdominal brain”, which has about 100 billion nerve cells, more than the nerve cells in the spinal cord. According to Wang Shenglong of the Department of Endocrinology of Anyang Second People’s Hospital, a person’s internal organs pass about 30 tons of nutrients and more than 50,000 liters of fluid in 75 years, and the amount of these passages is highly controlled by the abdominal brain. The abdominal brain analyzes thousands of chemical components and keeps the body safe from various toxins and dangers. The intestine is the largest immune organ in the body, it has 70% of the body’s defense cells, a large number of which are connected to the abdominal brain. When a toxin enters the body, the ventral brain is the first to detect it and then immediately sends a warning signal to the brain, where the stomach and intestines immediately recognize the presence of toxins in the ventral brain and take action: cramps, vomiting or abdominal leakage. The abdominal brain can also be sick, and more so than the mind. When the abdominal nerves are dysfunctional, the abdominal brain goes “crazy” and causes digestive dysfunction in the body. Studies have shown that the abdominal brain also has a memory function. Excessive or constant panic not only leaves an impression on the mind, but can even imprint the gastrointestinal organs. A diseased abdominal brain directly affects sleep. When a person is asleep, the gastrointestinal organs perform gentle rhythmic waveform movements, but when dreaming, intense tremors occur. In turn, stimulation of the viscera and their serum-based cells can cause a person to dream more. Many patients with gastrointestinal disorders always complain of poor sleep, and herein lies the reason. Second, the traditional health practitioner’s understanding of the human abdominal exercise Traditional health practitioner believes that “the way to maintain health, to the essence of the treasure,” where the “essence” refers to the body’s endocrine glands, especially the secretions of the gonads, that is, hormones. The hormones enter the capillaries around the glands and circulate with the blood to all parts of the body to regulate the body’s growth, development, material metabolism and the activities of tissues and organs. These secretion glands were called by the ancients as the essence of innate nature. The essence of diet and nutrition, that is, the acquired essence. The innate essence is supported by the acquired essence. The refinement and absorption of the acquired essence mainly depends on the function of the stomach and intestines. The main organs of the human digestive system, namely the stomach, intestines, liver, gallbladder and reproductive organs, are located in the abdomen, which is called the Dantian. The Dantian has always been considered by health practitioners as the “root” of practicing gong, the place where “the furnace is set up” to refine the golden elixir, and the source of refining essence and transforming qi. According to health practitioners, qi is a kind of energy flow in the biological field of the human body, and is also the root of life phenomena, which is called “yuan yang” by Taoists. The strength and circumference of this energy determines the vitality and vigor of the human body, which is inherent, but can be enhanced through exercise. Chen’s Taijiquan is the best choice for exercising the second brain (abdominal brain) Chen’s Taijiquan’s qi sinking into the Dantian and Dantian internal rotation method is a unique exercise method that combines breathing exercises, abdominal exercises and pelvic exercises. All the movements require inhalation, abdominal tightening, anal lifting and loosening of the hips, and exhalation, relaxation and sinking when changing strength. This fast and slow, rigid and flexible, loose and tight, up and down, front and back, left and right three-dimensional spiral movement, in the outside to strengthen the exercise of the abdominal muscles waist muscle, in the abdomen of many organs to play an organic shock and massage, thereby enhancing the body’s neural regulation, digestion, absorption, reproductive function, powerful exercise of the abdominal brain.