By Katie Cannon, Senior Multimedia Editor
Cameron Spencer / Getty Images
A competitor eats a raw egg at a checkpoint during the 2010 Urban Max Series adventure race at Wentworth Park on Nov. 20, in Sydney, Australia. Participants competed in pairs of two and were challenged to reach predetermined checkpoints by solving riddles using only using only a mobile phone, map and cue sheet. Contestants could walk, run or take public transport but the use of cars, bikes or taxis meant instant disqualification.