Challenge riding is a form of cycling where the riders challenge themselves rather than each other. Some challenge rides are charity events or pledge rides. Some are organised as pre- or early-season training events. Others, often referred to as Randonnées, brevets or Audax events occur simply for the sake of the challenge; cyclosportive events allow cyclists to test themselves over challenging race routes used, for example L'Étape du Tour in the Tour de France. Most challenge rides are open to all comers, but a few require qualification to attend.