What is roller derby?

Well, that's the question really, isn't it? As I'm pretty new to it myself, I thought I'd let Wikipedia explain:

"Roller derby takes place on a circuit track. Offense and defense are played simultaneously.[68] The two teams playing send five players each onto the track — one jammer (scorer), three blockers (defense), one pivot (a blocker who may become the jammer later in that jam). Helmet covers are used to display the players' positions: a cover with two stars is used for jammers, a striped cover is used for pivots and no cover is used for blockers.

Pivots and blockers from both teams start the game by forming a single pack. In a pack, all players face counterclockwise. The track has two lines marked across the track 30 feet apart, a pivot line and a jammer line around which the players build their initial formation.

Pivots line up on the pivot line and all blockers must line up behind them in any order they choose. The two jammers, who are not considered to be part of the pack, are positioned on the jammer line 30 feet behind the pivot line.

The referee signals the start of jam formation by blowing a whistle. During jam formation, the entire pack moves counterclockwise, during which time players can change position. All pivots/blockers must remain in the pack (i.e., no more than 20 feet in front of or behind the largest group containing blockers from both teams ). When the last person in the pack has passed where the front of the pack was initially lined up, the referee blows the whistle twice, signaling the jammers to take off, and play begins in earnest with a jam.

A jam is a 2-minute countdown period during which both teams attempt to score points. Points can only be scored by the jammers, who, moving counter-clockwise, attempt to pass the pack and lap around as many times as possible. After passing the pack the first time, jammers earn one point each time they legally pass an opposing blocker/pivot. During a jam, all pivots/blockers must remain in the pack. Pivot/blockers attempt to assist their jammer through and out of the pack while simultaneously stopping the opposing jammer from exiting the pack. If a pivot/blocker falls or otherwise becomes separated from the pack, she is out of play (i.e., cannot block or assist the jammers) until she rejoins to the pack.

The first jammer to legally pass all pivots and blockers once the jam begins wins the status of lead jammer for the remainder of the jam. The lead jammer can decide to end the jam at any time before the 2 minutes are up. She does this by placing her hands on her hips repeatedly, which signals the referee to officially call off the jam."

Yeah, so that's that. For the visual learners amongst us, here's a nifty YouTube explanation that explains the same thing in a different way:



Oh yeah, and watch Whip It. It's good.



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