I used to do Karate ( San Chi Kai ) in Oz, when I was about 15, and about 2 years ago I did Gracie ( Brazilian Jui Jitsu - http://sfuk.tripod.com/clubs/anaconda.html ), but I kept getting my ribs cracked during training, so I've had to give up for now. I only weigh 65kg, so when I was grappling guys who weigh 80-100Kgs and they had me pinned down, usually my ribs is what gave way .

I'm hoping to go back one day, as it was the most exhaustive training I have ever done. Really great work-out.