To tell the truth, folk qigong masters are beyond the understanding of ordinary martial artists. Since there is a theory of Qigong, and the unsolved mystery also mentions why it is difficult to explain why people can't eat when crossing the valley, then this energy must be drawn from nature, just like plants absorb sunlight for photosynthesis. It is understandable that once qigong is established, it can be practiced through the valley. Although most of China's martial arts methods have been lost, it is not necessarily that no one can make a breakthrough. Since the ancients can dig out qigong, it's not surprising that so many people in China have something on them. As for lightness skill, for example, qigong is regarded as airflow, and airplanes fly by using the pressure principle of airflow. Fireworks were invented by ancient people. Isn't it the principle of using high-speed jet energy? It may be that a master puts qi in his body on his posture reasonably, but it is not without flying skill floating on the water! Most of the real kung fu comes down in one continuous line. Unfortunately, China's cultural "historic sites" can still be preserved. How much can I really keep?