Judo
Judo means "the gentle way" in Japanese. Of course, it is derived in part from jujitsu, the hand-to-hand combat technique of ancient samurai warriors, and everything is relative.

Combat Sambo
Combat Sambo (Russian: Bojewoje Sambo). Utilized and developed for the
military, this is arguably the root of Sambo as it is now known, and includes practice with weapons and disarming techniques. 

Kickboxing
Kickboxing is a generic term for a sporting martial art that, similar to boxing, but uses the feet as well as the hands for striking. Kickboxing can be practiced for general fitness, or as a full-contact combat sport.

Boxing
Boxing ranks among the Olympic Games' most illustrious sports. It is a sport where two participants of similar weight attack each other with their fists in a series of one to three-minute intervals called "rounds".