Brazilian Jiu-Jitsu (BJJ), also known as "the gentle art" was developed by the Gracie family in the early part of the 20th century. BJJ is one of the most effective martial arts in existence due to its practical application and the fact that it has and is constantly tested against other martial arts styles. BJJ is both applicable for self defense and sport competition. In fact, BJJ was instrumental in the development of Mixed Martial Arts and remains a core part of MMA today.