Speed & Roller Derby

Roller derby is an American-invented contact sport - and historically, a form of sports entertainment - based on formation roller skating around an oval track, with points scored as two individual players (designated as "jammers") lap members of their opposing teams whilst both teams play offense and defense simultaneously. In past decades, roller derby had primarily been a professional or paid sport for both women and men. Contemporary roller derby is international and predominantly female with over 500 women's leagues in 16 countries, typically operates on an amateur (or unpaid) circuit, and has a strong do it yourself ethic which often features both athleticism and a punk third-wave feminist aesthetic.​ (Source)