Paralympic champion Richard Whitehead has started his gruelling charity run from John O'Groats to Lands End.
The athlete from Nottingham believes that running 40 marathons in 40 days will be the hardest thing he's ever done. Here he is speaking to us a few miles in....
After completing 40 marathons in 40 days, Richard Whitehead is already planning his next challenge.
Richard Whitehead completes his 40th marathon in 40 days today.
See pictures of Richard Whitehead arriving in his home city of Nottingham as part of his charity challenge to run 40 marathons in 40 days.