BRADFORD, ENGLAND - JANUARY 13:  Competitors cycle the course before the day's racing at the 2013 National Cyclo-Cross Championships in Peel Park on January 13, 2013 in Bradford, England. The sport of cyclo-cross, featuring ,lightweight bikes with off-road tyres, has dramatically increased in popularity over the past few years. Cyclo-cross courses are often run over a mixture of terrains from tarmac to mud and frequently include obstacles or steep inclines where riders have to carry their bike.  (Photo by Oli Scarff/Getty Images)