Khan, haha, there are hints in the simple legendary martial arts. Those who practice boy's kung fu must be people who have never broken their bodies. They have to sit still and take a deep breath every day, that is, meditate, and then constantly exercise with the power of pure yang, that is, attack with strength, so that the endurance of the body can reach the point of infertility, because pure yang is needed, so they can't break the body. Once Yuan Yang has loose bowels, it means giving up his previous job. Haha, it's better to practice qigong.