Martial arts are traditional sport, which have branched out a variety of fist fighting techniques after thousands of years of development. These fist fighting techniques of different schools and sects are so different in styles and strong points, but they have greatly enriched the contents of martial arts. Fist fighting techniques have been classified in relation to their unique characteristics in two main categories: the internal style and the external style. Geographically classified, there are the Southern style and the Northern style. The sets of fist fighting techniques handed down till today boast over 100 varieties, and below are the introductions to some major sects.