never done kick-boxing, but i do tae kwon do 2ce a week, and i imagine its fairly similar. the sparring sessions are pretty intense. kicking, punching, blocking, jumping, spinning, all that. constant movement, if only for like 2 mins at a time, still takes it out of you. i always take insulin just before, and usualy own a can of rockstar or red bull, then i know i have the insulin to deal with the sugars, and enough sugar that i wont go into a hypo. the smart thing to do would be to take just the right amount of insulin, but with something like that, its hard to know how much is enough. with a longer session of excersize, you have more opertunity to adjust as needed, but for a short all out burn, you dont realy have the option, i just make sure i have enough sugar and insulin in me to last, i can always fine tune it after if need be.