A Beginner's Guide to Roller Derby - sports.how
https://sports.how/roller-derby/beginners-guide
WEBJul 19, 2023 · Roller derby is a team sport played on an oval-shaped track. Two teams, each consisting of five players, compete against each other. The objective is for a designated player, called the "jammer," to score points by lapping members of the opposing team while the other players, known as "blockers," try to prevent them from doing so.
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