Roller Derby is an American-invented contact sport with roots in sports entertainment. The game is based on formation roller skating around an oval track by two teams. Points are scored as the designated scoring player (the "jammer") of both teams each laps members of the opposing team, including its "blockers," hence offense and defense typically occur simultaneously.
Contemporary derby is international and predominantly female with over 600 women's leagues, in more than 20 countries as well as a growing number of male, co-ed, and junior leagues.
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Roller Derby Organizations
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