Because roller derby uses a penalty box, power plays, where one team has a temporary numerical advantage, have major effect on scoring. The blockers simultaneously defend by hindering the opposing jammer, while also playing offense by maneuvering to aid their own jammer. The jammer scores a point for each opposing blocker they lap. Each team, typically with a roster of 15, fields five skaters during each jam: one jammer, designated with a star on their helmet, and four blockers. Ī 60-minute roller derby game, or bout, is a series of two-minute timed jams. It is played by approximately 1,250 amateur leagues worldwide, mostly in the United States. Roller derby is a roller skating contact sport played on an oval track by two teams of five skaters. Roller skates, helmet, knee pads, elbow pads, wrist guards, mouthguard 15 on roster, up to 5 on track during each jam.
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