The former Royal Marine – who toured Afghanistan and Iraq – took 19 hours to run back and forth 15,400 times.
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The 30-year-old raised £6,700 for Age UK while being cheered on by girlfriend Sophie Skipper, 27, and hundreds of people watching live online.
In order to keep himself on his toes, Sean donned different outfits – including a summer dress and bra – throughout his 100km ordeal.
He said: “Sophie was doing the commentary and I started taking requests from people following along on Facebook on what outfits I should wear whilst completing the challenge.”
Before the coronavirus locked down the country, Sean, from Colchester, Essex, had set up a personal training business.
Sean chose Age UK because he wanted to help the people struggling the most with self-isolation.
He added: “Every minute after about six hours I was in absolute agony, and equally hard physically.
“I just had to break it down into small manageable chunks so it seemed less of a giant task.
“I have to admit I was a little worried by how tired I was just 30km in, but there wasn’t really a point where I lacked the self-belief to finish.
“But, I have to admit, when I finished the first marathon, and realised I still had a full marathon plus ten miles on top of that… I had a little cry in my head!
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“The stop/start nature, and constantly turning around sapped my energy far more than a normal run but I knew I couldn’t stop because of the stick I’d get from my mates.
“Sophie held out a toilet paper finish line, and I just doubled over as soon as I crossed the line.”
Sean’s JustGiving page can be found at justgiving.com/fundraising/sean-wilson21.
Join our George Cross campaign for NHS staff
SUN readers are today urged to sign a petition calling for our NHS staff to be awarded the George Cross.
Yesterday, we backed a proposal by Lord Ashcroft to honour our health heroes with the gallantry gong given for acts of bravery that did not take place in battle.
A No10 spokesman said: “The NHS is doing a fantastic job and the nation will want to find a way to say thank you when we have defeated this virus.”
SAS hero Andy McNab added: “The award of a George Cross would show an emotional appreciation.”
We are asking readers to sign the petition online at thesun.co.uk/georgecrossfornhs.
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