Competitors from Team Unicorn and the D&#39;Viants compete during Bout One of the Sydney Roller Derby League on May 11, 2013 in Sydney, Australia. The wildest thing on eight-wheels, these &#39;Warriors&#39; of Roller Derby are jamming a blend of athletisim and pop culture through bumps, bruises, hip-whips, tattoos, fishnets and big characters as the fastest growing Women&#39;s sport on the planet, with over 1200 amatuer leagues worldwide. Originated in the mid 1930&#39;s as endurance skating, the modern revival of Roller Derby early in the 21st century can be artibuted to an all-female participation who share a strong &#39;do it yourself&#39; ethic.