Roller derby is a roller skating contact sport played on an oval track by two teams of five skaters. It is played by approximately 1,250 amateur leagues [note 1] worldwide, though it is most popular in the United States. [2] A 60-minute roller derby game, or bout, is a series of two-minute timed jams. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.