This Dutch city square became an extreme biking arena for the weekend. Now women are allowed to compete

By Maya Baylis, CNN Swedish mountain biker Alma Wiggberg, 23, maneuvers her bike up some winding stairs and onto a roof of a building in Groningen in the Netherlands. The roar of 20,000 spectators rises from the Dutch market square 50 feet below her. Her mind blank, she does a final exhale, a head shake,