Why is there one martial arts in the world?

Although Wushu has many sects and various forms, it has not left the "four fights", that is, "fighting (including. Points), kicking, throwing (including' serving') and taking "; "Eight methods", namely "hands, eyes, posture, footwork, spirit, qi, strength and kung fu"; Why is there one martial arts in the world?

Although Wushu has many sects and various forms, it has not left the "four fights", that is, "fighting (including. Points), kicking, throwing (including' serving') and taking "; "Eight methods", namely "hands, eyes, posture, footwork, spirit, qi, strength and kung fu"; "Twelve shapes" means "moving like a wave, quiet like a yue, rising like an ape, falling like a magpie, standing like a pine, standing like a crane, turning like a wheel, disassembling like a bow, as light as a leaf, as heavy as iron, as fast as the wind and as slow as an eagle". As far as the effect it pursues is concerned, it is nothing more than three aspects: fitness, anti-violence and developing human potential. From the requirements of practicing boxing, it is emphasized that the spirit should be restrained, relaxed and explicit, internal and external coordination, flexibility, steadiness, quickness and strength, outwitting others with skills, without brute force. From the perspective of boxing theory, they all emphasize "Yin-Yang and Five Elements". From the moral point of view, they all emphasize being brave, helping others, getting rid of violence, defending the country, resisting violence, not trying to be brave and winning, and not doing bad things. So: "the martial arts family in the world."

Since there is one kind of martial arts in the world, why are there two schools of martial arts in the world? How to briefly summarize the differences between internal and external schools?

There are many kinds of martial arts in China. In order to make a scientific distinction, Wushu is divided into two types according to its main characteristics: internal boxing and external boxing, but this has nothing to do with "the martial arts in the world are whips, palms are like steel files, fingers are like hooks, strength is like Mount Tai, eyes are like electricity".