Flexibility is a bit general, in fact, people who don't practice martial arts will have good flexibility, but that flexibility is useless, can't transmit force, can't stand force, and the things they practice are soft and tough, like rattan, which should be called loose. This word can be better! Another misunderstanding is that people often exercise. When practicing martial arts or encountering a flexible movement, they are eager to succeed. This kind of tendon can only be regarded as hard tearing. If you don't exercise, you will return to the original level, or even worse, which will leave the root of the disease! Even if you don't practice boxing for several years, you can loosen it when you use it, because mastering the method of loosening through practice won't make your bones and muscles harden again. It's not that your muscles and muscles won't harden, but that you won't use the wrong lifestyle, including walking, standing and sleeping. The best experience of relaxing muscles and tendons is to relax and feel comfortable, just like a child of seven or eight years old. Soft body and smooth blood can reduce the chance of getting sick. Because tendons are relaxed, muscles will not be too nervous, which can give bones more activity and relieve stress. The average person may have buried the root of the disease by sitting for an hour every day, but after practicing to a certain extent, this hidden danger can be alleviated by stretching, similar to Baduanjin. Hard-boned people, because of their abundant yang and more vigorous qi and blood than ordinary people, are a little impatient, so they are blocked for a long time, while those born with weak bones and muscles have no strength and weak explosive power, which can be changed through cultivation (cultivation is not cultivation of immortals)