I always thought i would like to do one, UNTIL i read "Thrill of Victory, Agony of my Feet" and was like, OMG, hell no!!!!! That stuff is insane, and if i am saying it, that means a lot! lol. Well, these were big adventure races like eco challenge stuff. There is a 24 hour challenge local that i would be interested in, but probably never any time in the future because my schedule is pretty tight as is.