Watch Jacquie Bird's report
Mark Ormrod has spent the year taking part in some amazing challenges and raising more than £600,000 for veterans charity Reorg.
Now former Royal Marine and triple amputee is gearing up for his final fundraising effort of the year - a 24-hour Brazilian Ju Jitsu Roll-a-thon.
The charity Reorg uses this martial art to help support veterans, serving military and the emergency services and the money Mark has raised this year has gone towards supporting 120 people.
So finishing off the year of challenges with this one, seems like the perfect finale.
"We've spent the entire year telling everybody about Reorg and what they do and the whole point of this event is to show them and to invite them in to experience it, or at least to meet the team," said Mark.
Mark lost three limbs when he stepped on an IED while on foot patrol in Afghanistan.
He was told he would spend his life in a wheelchair, but proved all the doctors wrong by marching on the parade ground on prosthetic limbs to collect his tour medal just five months after his injury.
Earlier this year he was given an MBE for his work with veterans and it is this work that has inspired his incredible challenges.
He is a trustee of the Reorg charity and what started as a mission to raise £1,000 for it with a beard shave, quickly turned into something a lot bigger.
After he decided to do a 5k run on special running blades, a video of him falling and then getting up again went viral. The fundraising went crazy and so after the run, a sea swim followed and then a 99.9mile bike ride from North Devon to Plymouth.
To date, Mark has raised more than £560,000 through his fundraising and hopes to reach three quarters of a million pounds.
Why Brazilian Ju Jitsu?
"When I was injured, I felt I had lost a huge part of me, my identity, which was that Warrior Spirit, that wanting to go out and push my self physically, push myself mentally," he said.
"I had a martial arts background before and I loved it, I loved the physical side, the mental side. And this gave it back to me."
The Roll-a-thon will take place over 24 hours from Thursday 9 December to Friday 10 December.
A total of 50 gyms from across the world will also be taking part.