Once upon a time, everybody was kung fu fighting, but now, you're nothing if you can't mix it up. And nothing is as throw-down, kick-butt and don't-bother-to-take-names as krav maga. Developed for use by the Israeli special forces, it's a mix of nearly every fighting style with the basic tenant that you use whatever works. Around here, it's also a killer workout and a great way to impress upon your friends not to mess with you. Just take them to a class with you. They'll get the hint.