In fact, fitness is just beautifying the body. It's no use practicing simple fitness. In ancient times, people's muscles were very good, because they were all labor and there was no fat, so fitness had no effect on any part. If you increase your strength, you mainly need physical training, strength skills and how to exert your strength, such as how to punch. Fighting boxing is only through the posture of legs and the coordinated movements of the body. This is physics!