Runners set for London marathon
22 April 2012 Last updated at 08:28 BST
An estimated 37,500 fun runners, amateur athletes, celebrities and elite sportsmen and women will take part in the Virgin London Marathon later.
Among the runners, more than 100 people will be attempting to break world records.
Runner Jo Stocks - dressed as Robin Hood - speaks about her goal to run all the major world marathons in 2012, while singer Will Young and Olympian James Cracknell explain their reasons for taking part in the race.