Ernesto Frits Hoost is a Dutch retired professional kickboxer. A four-time K-1 World Champion, Hoost is considered to be one of the greatest kickboxers of all time. Debuting in 1993 at the K-1 World Grand Prix 1993, where he came just one win short of the world title, Hoost announced his retirement thirteen years later on 2 December 2006 after the K-1 World GP Final tournament in Tokyo Dome, Japan. Hoost holds notable victories over Peter Aerts (4x), Branko Cikatić, Mirko Cro Cop (3x), Jérôme Le Banner (3x), Andy Hug (3x), Ray Sefo (3x), Musashi (2x), Mike Bernardo, Francisco Filho (2x), Sam Greco, Stefan Leko (3x), Mark Hunt, Cyril Abidi, and Glaube Feitosa.

Kickboxing is a full-contact hybrid martial art and boxing type based on punching and kicking. Kickboxing originated in the 1950s to 1970s. The fight takes place in a boxing ring, normally with boxing gloves, mouth guards, shorts, and bare feet to favor the use of kicks. Kickboxing is practiced for self-defense, general fitness, or for competition. Some styles of kickboxing include: Full contact karate, Muay Thai, Japanese kickboxing, Lethwei, Sanda, and Savate.