That's quite the mix Durandel! I take it then that you've practised quite a few breakfalls in your day. Personally, I hate doing anything that involves a forward flip or roll. Do you still do any of the above mentioned styles today?
Judo was great fun. We got to do flips and get our asses kicked by the grand master and the guy who holds the world's record for most cement blocks broken (at the time, anyway). Very good workout, and very fun.
I did one class of Ju Jitsu, which was more than enough to convince me that I could never put myself through that insanity on a regular basis. Ju Jitsu is essentially what wrestling (the real kind) would be if chokes, strangles, and everything illegal was made legal.
Sadly, I don't practice any of them anymore, but the stuff sticks with you. Last year, after almost 3 years of not practicing, I went to a class for fun and was able to perform as though I'd never stopped. Needless to say, I'm confident in my ability to defend myself if attacked.
Back in the day, I could easily break two boards with a palm-heel strike, and I'm sure I could today. I never got to try a cinder block, though I hear it's just like breaking two boards.
Just for reference, the Kyu Ki Do belt rank system is slightly different than Karate. It goes...
White.
White with Yellow Stripe (senior white belt).
Yellow (junior yellow).
Yellow with Green Stripe (senior yellow).
Green (junior green).
Green with Blue Stripe (senior green).
Blue (junior blue).
Blue with Brown Stripe (senior blue).
Brown.
Red.
Black (10 degrees after that).
So, I was a mere 4 degrees from my black belt. Too bad, but I just had too much to do in terms of school and stuff to make an active commitment to it anymore.