Qigong is an ancient Chinese traditional method of health preservation, its history can be traced back to thousands of years ago. Some people believed that qigong could cure diseases, improve physical fitness, and improve mental state, so it was widely used in the past. However, in recent years, with the deepening of scientific research, the true effectiveness of Qigong began to be questioned. At present, there was no scientific evidence to prove the existence of Qigong. Although some people claim to have practiced Qigong, these methods may just be traditional physical training methods that are different from the essence of Qigong. If you want to understand Qigong, you can consult relevant scientific literature or consult professionals to obtain more accurate information. As for Qigong secret books, due to the complexity and variety of Qigong methods, professional publishing houses generally wouldn't publish related books. If you want to know more about Qigong, you can get relevant information from some formal academic journals or online courses.