A Milton Keynes man is embarking on a gruelling challenge later, completing not one, not two, but thirty marathons.
Charlie Wardle wants to complete the equivalent of a marathon every single day this month to raise thousands of pounds for charity.
After months of training, he plans to run, jog and walk the 26.2 miles around his home town each day in June.
His target is to raise £30,000 for Climb Your Mountain - a charity he founded four years ago after a difficult period in his life.
"I didn't realise it at the time, but I was suffering from depression", he told ITV Anglia.
"During that time I ran a number of marathons overseas to raise money for charity and found it made such a difference to my well-being.
"The training, the focus, the sense of achievement and the fact it was so positive all made a real difference both physically and mentally, and that's what inspired the charity."
Since it was founded, Climb Your Mountain has helped more than 1500 people experiencing stress or depression take part in activities and challenges.
The money raised will help fund his charity for a further 12 months.
Charlie hopes people will show their support by joining him on his marathon challenge and says he's been inspired by recent Sport Relief fundraisers by David Walliams and comedian John Bishop.
"You can't just go into a challenge like this willy nilly and just expect it to happen. You've got to train for it, you've got to have the right support and you've got to have that desire and determination", he says.
He aims to complete his first marathon in five and a haf hours. He's due to set off from the David Lloyd Leisure Centre near Willen Lake at 9.30am this morning, where he'll be joined by local Olympic Gold medalist Gail Emms.
For more information go to www.runwithcharlie.org or www.climbyourmountain.org/