K-1 is a combat sport that combines stand up techniques from Muay Thai, Karate, Taekwondo, Savate, San Shou, Kickboxing, traditional Boxing, and other martial arts to determine the single best stand-up fighter in the world (the "1").
The K-1 organization's governing body is Fighting and Entertainment Group (FEG). They organize a variety of fightsport events in Japan and around the world.
There are K-1 Regional Elimination Tournaments which qualify fighters for the K-1 World Grand Prix, along with licensed K-1 Fighting Network events designed to develop new talent internationally and there is also a 70.5kg (155lb) Super Middleweight division called K-1 MAX ("Middleweight Artistic Xtreme").
In 2007, K-1 introduced a two new Title belts separate from K-1 World GP Champions, Super Heavyweight World Title for fighters over 100kg/220lbs and Heavyweight World Title for fighters under 100kg/156-220lbs. FEG also promotes HERO's mixed martial arts events.