Traditional health science believed that the main function of the HE Exercise is to regulate the heart. The He Exercise can discharge and remove the foul smell of the heart. The expiration and inspiration and Tao Yin of the HE Exercise in the Health Qigong • Liu Zi Jue are mainly developed around the heart.

Heart is the lord of internal organs in the Chinese traditional health cultural context. "Huangdi Neijing-Su Wen (Inner Canon of Yellow Emperor-Plain Questions)" said, "The heart, the king of internal organs, is the origin of wit and intelligence. "Heart is the command and dominates the human heart and the organs of each substance, the same as the monarch. Why heart was called the king of internal organs by the ancients? There were two reasons. First, traditional Chinese philosophy attaches the importance of the mind. Since ancient times, there was "the philosophy of the mind" and "heart-mind theory" in the Chinese traditional philosophy. "Meng Zi • Jin Xin Shang" said, "The virtuous nature of human is blessed with the god, and understanding the human nature means knowing the will of god. Cultivate the kind nature and wait for the fate to settle down to a quiet life. "Heart can communicate with the world, which is the foundation for the life. When comparing the Chinese and Western philosophy, Mou Zongsan noted that the discourse of the heart is one of the biggest differences between the two. It can be seen that the important position of heart in the Chinese traditional culture. Heart is taken as the king of internal organs by the traditional health science, which also reflects that the Chinese philosophy attach much importance to spiritual problems. Second, from the perspective of health science, heart governs blood and vessels, and it is the container of the spirits. The heart is the unique organ that not controlled by the mind, but it is related to each part of the body through the blood. Blood is transformed to the whole body, which can provide the material and energy required by each organ and take away the metabolites. It can be seen that the important status among the internal organs. Why the heart can store the spirit? "Huangdi Neijing • Ling Shu (Inner Canon of Yellow Emperor • Miraculous Pivot)" said, "The heart, the master of the internal organs, is the house of the spirit." Heart is the container of the spirits, the brain is the control organ of the spiritual consciousness, and the blood and nutrients needed by the brain are directly transformed by the heart. Thus, the strength of the heart function is directly connected with the activities of mind, then the heart will link up with the spirit.

The HE Exercise can regulate the heart. Upward tongue and the margin of the tongue touching the alveolus will form the tongue voice. The tongue position is described as slight and light by the research team, the intention of which is quite deep. The practitioners should attach great importance. The main purpose to practice slightly and lightly is to avoid the tension of the tongue, affecting the formation of the tongue voice. In the practice of HE Exercise, the tongue is relaxed and naturally tiled, the jaw is slightly open, in order to make the tongue voice. The manner of articulation can be summarized as one sentence, i.e. make the tongue voice with tiled tongue and open lower jaw.

The tongue voice can regulate the heart condition the heart and clear away heart heat. First, tongue and heart are interrelated in the traditional health science, namely the tongue corresponding to the heart." "Huangdi Neijing • Ling Shu (Inner Canon of Yellow Emperor • Miraculous Pivot)" said, "The heart qi connects the tongue, so people can distinguish the different flavors through harmony of heart." Heart governs the blood, and the tongue is related to the heart, so the tongue can distinguish all flavors under the normal circumstances of the heart. Conversely, if the tongue cannot distinguish the tastes, people should consider the problem of heart. Secondly, the tongue voice and the heart all correspond to the fire in the five elements. Human organs are divided into yin and yang by the traditional medicine. Heart corresponds to the yang and fire in the five elements. Heart heat can not only maintain its own physiological functions, but also can warm the body. However, the excessive heart fire will lead to the negative impact on human body. Comparing with the other four exercises, the mouth and face are the most relaxed when making the lingual. Therefore, the HE Exercise is completed in a state of calm, which is very beneficial to relieve the heart fire. "Xiu Ling Yao Zhi" written by Leng Qian in the Ming Dynasty said, "Practicing the HE Exercise in the summer can regulate the heart", which not only show the efficacy of the firelight, but also contact the HE Exercise with the four seasons.

The body movements of the HE Exercise can remove the firelight. The movement essentials of HE Exercise in the Health Qigong • Liu Zi Jue are as the following. Palms up from the front of the abdomen to the chest, with palms inward. Two middle fingers are about the same height with the chin. Palms thrust downwards slowly. The entire action is a cyclic process. Scoop up some water with hands before the belly, palms up to the mouth, go into the heart, palms down to the belly. It is primarily designed to achieve the heart-kidney interaction and coordination of water and fire. First, the heart is the container of the spirits, corresponding to the fire, while the kidney is the container of the essence, corresponding to the water. The heart-kidney interaction will be able to reconcile the two functions, to avoid the excessive firelight and kidney water. Analyzing the entire movements, we can see its meaning that palms up from the belly to the mouth, and guide the kidney water upward to nourish the heart and guide the firelight downward to warm the kidney water. In addition, from the perspective of essence and spirit, the kidney is the congenital origin and the house of the primordial qi, while the heart is the king of internal organs and the house of the spirit. Eventually, it will reach the heart-kidney interaction and coordination between water and fire. To understand and remember the physical actions, we can summarize them as one sentence, i.e. palms up from the belly to the mouth, to guide the kidney water nourish the heart.

To sum up, the practice essentials of the HE Exercise in Health Qigong • Liu Zi Jue can be summarized as the following two sentences.

Make the tongue voice with tiled tongue and open lower jaw.

Palms up from the belly to the mouth, to guide the kidney water nourish the heart.

（Chao Shengjie  Jin Xiaofeng）