Taekwondo is the national sport of South Korea and one of the most popular martial arts globally in terms of practitioners. It has a belt ranking system of 9 kup (gup) levels and 1-10 dan levels, and its history has been debated as originating from native Korean martial arts with some influences from karate and neighboring countries. Taekwondo competitions involve poomse (forms) judged by referees on technique and sparring under rules where black belts fight full-contact 2-minute rounds.