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Qigong is a unique fitness technique in China. Basically divided into two categories, one is static, standing still, sitting still or lying still, so as to concentrate, breathe in a special way, and promote the functions of circulation, digestion and other systems. The other is mainly about exercise, generally adopting moderate exercise, massage and other methods, and insisting on regular exercise to enhance physical fitness. (Modern Chinese Dictionary)
The "qi" in Qigong is not the "qi" in physics, but the "vitality" in traditional Chinese medicine, which is vitality and can be understood as energy by so-called modern science. However, it is different from the energy mentioned in physics. Physical mechanics is based on western science, and the energy of Qigong should be understood by China's traditional cultural thought.
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Explain yoga in my own popular way, that is, martial arts soft work combined with a breathing method. Yoga has something in common with Tai Ji Chuan and Qigong, but it is fundamentally different in essence. Yoga emphasizes the so-called "three rounds and seven turns", which is essentially different from Wushu and Qigong.