Roller derby has enjoyed a bit of a resurgence in the last decade, not just because of the beautiful women, but because it’s a serious game with real points and real injuries. But this isn’t your grandmom’s roller derby anymore.

Derby once boasted incredibly violent moves like clotheslines, tackles and face punching but those days are long gone. Any of those moves will get you kicked right out of a league.

For guys and girls looking to learn more about the sport Wired.com posted this handy guide to the rules and nuances of roller derby. It not only lays out the basics of the game from scoring to the differences between the jammers, blockers and the pivot, but also the legal ‘pro-moves’ from backwards blocking to the whip.

If you do end up attempting any of these moves, please make sure the roller rink is empty and that you’re fully paid up on your medical insurance.

[Via Wired]