Superfit Sam Robson completed the London Marathon before continuing past the finish line – and jogging nearly 100 miles home.
Sam, 28, crossed the finish line near Buckingham Palace on Sunday just three hours and 45 minutes after setting off from Greenwich Park.
But instead of stopping he carried on through the night and ran 99 miles to his hometown of St Ives, Cambs.
During Sam’s marathon effort he burnt off a staggering 15,000 calories and completed a staggering 125.2 miles in just 29 hours.
Epilepsy sufferer Sam, who works as a research scientist, told today how he completed the challenge to raise money for the Epilepsy Society.
He said: ”For most people the finish line of the London Marathon was the end but for me it was just the beginning.
”In terms of tiredness my legs felt pretty good throughout the run and the worst bit was that I had to keep eating to replace all the calories I was burning.
”I had to have regular breaks to refill my water and whenever I stopped my legs seized up so I couldn’t rest for long.
”Running was fine but stopping was the hardest part. It was a great feeling crossing the line although I was pretty exhausted.
”I woke up this morning feeling surprisingly good. My hip was a bit sore last night but it feels okay now and my legs are absolutely fine.”
Sam, who was diagnosed with epilepsy aged 12, became a keen runner after he completed his first half marathon with his father in September 2009.
He decided to attempt his London Marathon challenge after gradually increasing his endurance until he could 100 miles every week.
Sam set out from London at 9.45am on Sunday before crossing the finishing line 3 hours and 45 minutes later to complete his first ever marathon.
However, instead of stopping Sam carried on running through the night and completed a further 99 miles before arriving in St Ives, Cambs., at 2.45pm on Monday.
During the 125.2 mile run, which took him 29 hours to complete, Sam did not sleep and only took a short two minute break every ten miles.
His proud fiancee Jen Sykes, 28, a respiratory physiotherapist, led his support team and revealed she is ”amazed” he completed the challenge.
She said: ”I’m kind of amazed that he made it.
”He was diagnosed with epilepsy when he was in his teens and has always wanted to do something to raise awareness of the charity.
”Sam has never wanted to things by the half.”
Sam has raised £4,000 for the Epilepsy Society and anyone who wishes to donate should visit www.justgiving.com/sam-robson.