Brazilian Jiu Jitsu!
It is a fighting style built on flexibility basically. It is my favorite! Muay Thai is much like kickboxing, and BJJ is kind of like wrestling, I guess you could say. A lot of the MMA fighters use it (I am a MMA/UFC nerd... ehehe) and it is probably one of the best fighting tools a fighter can learn.
It is about discipline, stretching, flexibility, and the ability to keep your mind under control in a stressful/difficult position. It is a combat sport, which can be used in nearly any aspect of fighting. To me, any fighter who is well trained in BJJ can get out of any hold.
They must wear a "gee" or "gi" which is basically a karate uniform. BUT, it can come in many different colors. It is not restriced to white.
One of my favorite fighters, BJ Penn, has basically mastered the art of BJJ.
^ In this position, if he pulls harder (you extend your legs and it pulls his arm) it can dislocate the shoulder or if he twists snaps the arm.
^ Choke hold which can literally suffocate someone. If you are holding properly, they cannot get you off in this position.
Very short clip showing his flexibility after mastering BJJ...
The flexibility, strength, mind visial, etc apart of being into BJJ... (another short clip)
BJJ is a sport made for someone smaller, or perhaps weaker, to over-come a larger, stronger, bigger opponent.