GREAT FOR CARDIO & SELF DEFENCE A martial art, combat sport, and a self defence system that focuses on grappling and especially ground fighting. BJJ promotes the concept that a smaller, weaker person can successfully defend against a bigger, stronger assailant by using leverage and proper technique, taking the fight to the ground – most notably by applying joint-locks and chokeholds to defeat the other person. BJJ training can be used for sport grappling tournaments and mixed martial arts (MMA) competition or self-defence.