1930s. Sambo was introduced in the Soviet Union. Modern Taekwondo also emerged after the Japanese occupation of Korea and became an Olympic sport in 2000. Sanshou as part of modern wushu was developed in the People's Republic of China since the 1950s. Kickboxing and full contact karate were developed in the 1960s and became popular in Japan and the West during the 1980s and 1990s. Modern MMA developed out of the interconnected subcultures of Brazilian Jiu-Jitsu and shoot wrestling. It was introduced in Japan in the form of Shooto in 1985, and in the United States as Ultimate Fighting Championship (UFC) in 1993. The Unified Rules of Mixed Martial Arts were introduced in 2000, and the sport experienced peak popularity in the 2000s. During this period, multiple brands and promotions were established. The most well-known promotion for MMA is UFC. Popularity by gender Combat sports are generally more popular among men as athletes and spectators. For many years, participation in combat sports was practically exclusive to men; USA Boxing had a ban on women's boxing until 1993. A study conducted by Greenwell, Hancock, Simmons, and Thorn in 2015 revealed that combat sports had a largely male audience. List Unarmed Striking Karate Yoshukai Kyokushin Shotokan Chito-ryu Genseiryu Goju-ryu Gosoku-ryu Isshin-ryu Motobu-ryu Seidokaikan Shindo Jinen-ryu Shito-ryu Shorin-ryu Shukokai Shuri-ryu Uechi-ryu Wado-ryu Matsubayashi-ryu Shudokan Ryūei-ryū Shōrei-ryū Tōon-ryū Bōgutsuki Wushu Northern Praying Mantis Kung Fu Southern Dragon Kung Fu Monkey Kung Fu Jow-Ga Kung Fu Leopard Kung Fu Snake Kung Fu Bajiquan Zi Ran Men Bak Mei Emeiquan Mizongyi Mian Quan Chuōjiǎo Heihuquan Fu Jow Pai Hung Fut Duan Quan Choy Gar Li Yiquan Fut Gar Chow Gar Boxing and Kickboxing Amateur boxing Bare-knuckle boxing Professional boxing Greek Boxing English Boxing Russian Boxing Chivarreto boxing Cuban Boxing Filipino Boxing Japanese Kickboxing American Kickboxing Dutch Kickboxing Muay Boran Muay thai Muay Lao Lethwei Savate Pradal Serey Taekwondo ITF Taekwondo STF Taekwondo ATA Taekwondo Rhee Taekwondo Kukkiwon Taekwondo Extreme Taekwondo Kun Gek Do Suntukan Sikaran Tang Soo Do Taidō Adimurai Capoeira Nippon Kempo Luta Livre combate Grappling Wrestling Freestyle wrestling Greco-Roman wrestling Collegiate wrestling Scholastic wrestling Catch wrestling Submission wrestling Submission Arts Wrestling Combat Submission Wrestling Greek wrestling Professional wrestling Shoot wrestling Folk wrestling Cornish wrestling Cumberland Wrestling Westmorland wrestling Lancashire wrestling Devon wrestling Hayastan Freestyle Wrestling Iranian wrestling Khmer traditional wrestling Canarian wrestling Leonese wrestling Senegalese wrestling Kazakh wrestling Backhold wrestling Lutte Traditionnelle Jobbarer Boli