Brazilian Jiu-Jitsu is a sport, self-defense system, and a fitness program. It has proven to be the most practical and effective self-defense system in the world. It relies on leverage and technique, rather than strength and size. This allows you to defend yourself against much bigger, stronger attackers. As a result, BJJ is a great sport for everyone - including women and kids.
It is one of the fastest growing martial arts, due (in part) to its great success in the UFC (Ultimate Fighting Championship) and Mixed Martial Arts in general. BJJ focuses on grappling and ground fighting with the goal of getting into a position to force an attacker or opponent to submit or give up.
BJJ is also an intense, aerobic and anaerobic workout so your overall health and fitness will improve, including your flexibility, strength, cardiovascular fitness, ability to burn fat, and muscular endurance.