Roller derby is a sport (kind of) that involves two teams skating rounds around an oval track and trying to get ahead of one another. The fun, of course, is that there are "blockers" who try to prevent the "jammers," or scoring players, from getting ahead.
If you're interested in playing roller derby, check out this video to learn how to knock 'em and block 'em.
Learn the rules and regulations of this exciting, fast-paced sport.
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