Roller derby is a fast-paced, full contact team sport played on roller skates. Over two 30-minute periods, two teams of five players compete in a series of two minute jams, in which the jammer from each team attempts to score points while the blockers assist their jammer and try to thwart the opposition. The jammer scores points by skating through the pack and gaining one point for each opposing team member they pass per lap.
Still not sure what we are talking about? See below a short video from BBC Sport on the rules of roller derby but not see some derby in all it’s sweaty, bashy glory?