Brazillian Jiu Jitsu(BJJ) focuses on ground fighting and uses locks, chokes and fancy joint manipulation to subdue the opponent. BJJ will make you fitter and more athletic, plus increasing you flexibility, and get you into overall much better shape. Beyond any physical improvements that come as a result of Brazilian jiu jitsu are the mental improvements. BJJ is a fantastic stress relief especially after a long day at work or school, you can walk into the gym and release it on the mat.