William Louis Wallace, nicknamed "Superfoot", is an American karateka, actor, and former professional kickboxer. Considered one of the first American superstars of kickboxing, he was the Professional Karate Association (PKA) World Full-Contact Champion, and the Middleweight Kickboxing Champion for six years, retiring with an undefeated 23-0-0 record. He is currently the International Ambassador for PKA Worldwide.

A roundhouse kick is a kick in which the practitioner lifts the knee while turning the supporting foot and body in a semicircular motion, extending the leg striking with the lower part of the shin and/or the instep. The ball of the foot can also be used to strike the target and is preferable when power breaking thick boards. This type of kick is utilized in many different martial arts and is popular in both non-contact and full-contact martial arts competitions. The kick has many variations based on stance, leg movement, striking surface, and the height of the kick.