Martial Arts Training Question

I was wondering if anyone knows how man calories one burns doing martial arts training, in particular Kung Fu?

I have returned to my training, and I would like to record this in my food / exercise diary, as my doctor finds me to be a tad lazy and so this would go towards showing him that I do get off my rear end.

I have searched the web to no avail, so I am hoping there are others here who do martial arts or have researched the benefits of training Thanks!

http://www.bodybuilding.com/fun/tietge13.htm

on that page, he claims he burns 1448 for a two hour workout.