Free combat has two meanings, so the content is different. One refers to various fighting techniques, and the other is the internationally popular American free fighting. American free fighting was founded by Bruce Lee's apprentice Joe Lewis, and some people mistakenly thought it was boxing plus karate. There are five kinds of American free fighting boxing methods: jab, straight fist, hook (that is, China's fist, but the action is relatively small, that is, the hook of western boxing), hook (that is, China's hook) and turn and swing (that is, Sanda's whip). There are five kicking methods: staring kick, hook kick (horizontal kick), side kick, back kick and spin kick. Knee technique was not used originally, but players added it mainly to participate in other competitions: punching and pushing knees.