Roller Derby is a full contact sport on quad roller-skates that has been around since the 1930's. It has evolved from its early days as a theatrical performance in the likes of WWE Wrestling into what is now a highly competitive (but still entertaining) feat of athleticism*.
Teams of up to 15 field five players at a time to battle it out in roughly 2 minute rounds of speed, strength and strategy. Each team fields a player called a Jammer - who wears a star on their helmet, and is the one who scores the teams points (Like a ball in rugby!). The jammer's race eachother through the other players (blockers), who don't make it easy! Points are allocated to each jammer every time they successfully pass an opposing skater.
Safety comes first, and each game has seven on skates referees calling penalties to prevent dangerous contact.
Roller Derby does have some complicated rules and team strategies, a bit like a chess on wheels, and can be chaotic to the untrained eye!
Rules are regulated by WFTDA- the Women's flat track derby association. There are over a thousand roller derby leagues across the globe. You can check out all the leagues that are recognised by WFTDA here https://stats.wftda.com/leagues
You can also view a roller derby game by going to https://wftda.tv/featured-categories/
