Ive never trained in a martial art (apart from fencing, not sure it counts) but from experiance i hold up quite well, mainly because im quite tall and quite strong, i have a few friends who do martial arts and are really good at them, but i can still take them in a fight because they favour style over brute force. i mean im in no way guaranteed to win a fight, the few ive been in are usually ties or get broken up by friends, and im not really very aggressive anyway, but yer, i can hold up ok, but by no means fantastically