Mark Sinclair

Recognised by Guinness World Records as the youngest person to run a marathon on all seven continents. His world record-breaking marathons have already taken him to Dubai, London, Rio, Sydney, New York, Antarctica and South Africa and Mark now wants to join the North Pole Marathon Grand Slam Club by running on the Arctic Ocean. The 25 year-old teacher's 2006 North Pole Marathon effort will be in aid of Great Ormond Street Hospital Children's Charity (GOSHCC).