the ITF. The ITF continued to function as an independent federation, then headquartered in Toronto, Ontario, Canada; Choi continued to develop the ITF-style, notably with the 1983 publication of his Encyclopedia of Taekwon-Do. After Choi's retirement, the ITF split in 2001 and then again in 2002 to create three separate ITF federations each of which continues to operate today under the same name. In 1972 the KTA and the South Korean government's Ministry of Culture, Sports and Tourism established the Kukkiwon as the new national academy for Taekwondo. Kukkiwon now serves many of the functions previously served by the KTA, in terms of defining a government-sponsored unified style of Taekwondo. In 1973 the KTA and Kukkiwon supported the establishment of the World Taekwondo Federation (WTF, renamed to World Taekwondo in 2017 due to confusion with the initialism) to promote the sportive side of Kukki-Taekwondo. WT competitions employ Kukkiwon-style Taekwondo. For this reason, Kukkiwon-style Taekwondo is often referred to as WT-style Taekwondo, sport-style Taekwondo, or Olympic-style Taekwondo, though in reality the style is defined by the Kukkiwon, not the WT. Since 2021, Taekwondo has been one of three Asian martial arts (the others being judo and karate), and one of six total (the others being the previously mentioned, Greco-Roman wrestling, freestyle wrestling, and boxing) included in the Olympic Games. It started as a demonstration event at the 1988 games in Seoul, a year after becoming a medal event at the Pan Am Games, and became an official medal event at the 2000 games in Sydney. In 2010, Taekwondo was accepted as a Commonwealth Games sport. Features Taekwondo is characterized by its emphasis on head-height kicks, jumping and spinning kicks, and fast kicking techniques. In fact, World Taekwondo sparring competitions award additional points for strikes that incorporate spinning kicks, kicks to the head, or both. To facilitate fast, turning kicks, Taekwondo generally adopts stances that are narrower and taller than the broader, wide stances used by martial arts such as karate. The tradeoff of decreased stability is believed to be worth the commensurate increase in agility, particularly in Kukkiwon-style Taekwondo. Theory of power The emphasis on speed and agility is a defining characteristic of Taekwondo and has its origins in analyses undertaken by Choi Hong-hi. The results of that analysis are known by ITF practitioners as Choi's Theory of Power. Choi based his understanding of power on biomechanics and Newtonian physics as