I do it for a couple of reasons. First and formost is because I like the fact that if I had to I could wreck somebody. As far as going to a gym, I need motivation, and going to the gym by myself just doesnt last very long. Plus I bore easy and lifting weights is boring in my opinion. I beleive you also stated other things you can do for cardio. Sure, but I like to do things like that outside, (mountain biking, hiking) I cant do that when the weather is crappy. And where I live that is 6mos out of the year. The dojo where I go is a mile from my house which leaves me with little excuse not to go. Also I am fortunate because the place where I train is awsome. It has many of the positive characteristics which have been mentioned on various forums, (even by Mr negative himself Redmond) My sensei is in his sixtys, Hall of Fame Karate coach, seventh dan. Several of the students have several golds and silvers in competition. International and national. Do not get the wrong opinion that this dojo is just a school for competing. For I am not interested in it myself. I kind of got off on a tangent about the dojo, but anyway learnig a craft that is challenging is interesting to me. Being able to do moves, combinations and the like, I think are kool. I am not crazy about Kata, but it is a part of the art. I am trying to set small goals so that I may achieve them. I am also an aggresive person, so after full contact sparring (normally on a Fri night) I feel invigorated and even high. All though often I am sore the next couple of days As far a grappling, we also do that. I myself am not that experienced with it for I am a novice, but someday I will be. Anyway I am tired of writing, I could go on and on and on and on