Brazilian Jiu-Jitsu?is a martial art, combat sport and a self-defense system that focuses on grappling and especially ground fighting. The art was derived from the Japanese martial art of Kodokan judo in the early 20th century, which was itself developed from a number of schools (or Ryu) of Japanese jujutsu in the 19th century.
It promotes the principle that a smaller, weaker person can successfully defend themself against a bigger, stronger assailant by using leverage and proper technique?most notably by applying joint-locks and chokeholds to defeat the other person. Brazilian Jiu Jitsu can be trained for sport grappling tournaments (gi and no-gi) and mixed martial arts (MMA) competition or self-defense. Sparring (commonly referred to as ?rolling?) and live drilling play a major role in training, and a premium is placed on performance, especially in competition.