Jade Egg Skill is a training method of ancient Taoist Qigong in China. Actually, it is to exercise pelvic floor muscles, which is nearly 2000 years earlier than what Kaigl said. At that time, it was used by ancient court women and prostitutes in brothels. In fact, jade egg skill is not only an internal skill to train pelvic floor muscles, but also an external skill to train back muscles, but not only jade eggs, but also eggs.

It turns out that when prostitutes were trained in ancient times, in order to improve their basic service skills, they were also required to have strong back muscles in order to better meet the needs of customers. At the beginning of the training, prostitutes are required to put jade eggs the size of eggs on their waists when men are in the upper position, that is to say, they must keep their bows and waists to cater to the impact of men. After training to a certain extent, eggs are required to replace jade eggs, and eggs cannot be broken after completing the whole process. Everything seems unique.