Parkour. Developed in France Parkour is derived from gymnastics and other martial arts. Parkour focuses on self defense through tactical retreat. Needless to say it takes a lot of guff for it. However the art continues to grow because it is fun and looks awesome. As a martial art I must give it some credit. Tactical retreat is sometimes a very good option.
http://www.holmesproduction.co.uk/ Great motivational quote for anyone training in muay thai, MMA or just for fitness in general; "You cannot dream yourself into a character, you must hammer and forge yourself into one. Every successful person did, what no one else is willing to do"