Brazilian Jiu-Jitsu (BJJ) 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.
It teaches that a smaller, weaker person can successfully defend 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 training can be used 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, in relation to progress and ascension through the grades/belts.
The Brazilian Jiu-Jitsu practitioner's uniform is similar to a judogi, but often with tighter cuffs on the pants and jacket. This allows the practitioner to benefit from a closer fit, providing less material for an opponent to manipulate, although there is a significant overlap in the standards that allows for a carefully selected Gi to be legal for competition in both styles.
The Brazilian Jiu-Jitsu ranking system awards a practitioner different coloured belts to signify increasing levels of technical knowledge and practical skill. While the system's structure shares its origins with the judo ranking system and the origins of all coloured belts. Some of these differences are relatively minor, such as the division between youth and adult belts and the stripe/degree system.
Others are quite distinct and have become synonymous with the art, such as a marked informality in promotional criteria, including as a focus on a competitive demonstration of skill, and a conservative approach to promotion in general.
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When it comes to Jiu Jitsu you dont even have to worry about having a Gi, if your a beginner and trying Jiu Jitsu for the 1st time you can borrow a professional Gi and see how you feel.