The first rule of Fight Club, yadda yadda yadda.
Mercenary disposition, need some money, offering lessons in self-defense with a side order of "how to kick ass, take names, blow bubbles in your gum, defend yourself from rapists and muggers without breaking a nail, and indulge in some totally awesome stress-relief at the same time".
18+, with ID, but if you are at least 14 and your parent brings you at least the first time (
and you still have proof of your identity and relationship) and they sign a permission form it's still cool, we just won't go quite as hard on you at first. ;)
[address of a run-down warehouse across an empty lot from a YMCA, so it isn't quite as sketchy as it might seem at first glance]