Here's a link to the rules, but they're very long!
http://wftda.com/rules" onclick="window.open(this.href);return false;
Basically, it's a team of 5 on 5, in each five you have a Jammer, a Pivot and 3 other blockers.
The aim of the game is for the jammers to get through the pack of 8 (made up of 4 on 4 including the pivot) and to lap the pack.
The jammer gains a point for each opposing blocker and pivot she laps. The lead jammer (the one that got through the pack first) can call off the jam tactically before the 2 minute jam is over if she is in the lead, hence gaining her team maximum points before the other jammer scores any.
Here's another link,
http://en.wikipedia.org/wiki/Roller_derby" onclick="window.open(this.href);return false;
You are not allowed to use elbows to hit opposing jammers and blockers, but you can use your shoulders and hips and knock them over! (Hence all the padding, helmet and mouthguard!)
Some more links
http://www.google.co.uk/url?sa=t&source ... pMKX9t2xZw" onclick="window.open(this.href);return false;
http://www.google.co.uk/url?sa=t&source ... uUVmo72G8A" onclick="window.open(this.href);return false;
Great fun, a great way to get fit, and since we've changed traiing to Sundays we all go to the pub after for a carvery