Jiu-Jitsu is a martial art that primary focuses on ground fighting and is considered by most one of the most effective martial arts for self defense. It is also one of the few martial arts that fighting off your back can be used to ones advantage. Jiu- Jitsu focuses on understanding the principle of "leverage" thus allowing a weaker (smaller) force to over come a stronger force through the application or proper technique rather than strength and aggression. Jiu-Jitsu utilizes the application of joint locks and chokes to control opponent or risk bodily harm.