Nathan Abbott, 22, from West Sussex was bullied mercilessly at school, so badly that he chose to leave.
Nathan was born with a bilateral cleft lip and palate and he would be bullied mentally and physically for it.
But he decided the bullies weren't going to beat him.
He decided to take up long distance swimming and started fundraising for cleft palate charities.
People would call me names, physically bully me, even to this day I can remember things that have been done to me, and I think it's something you can't get over 100%, you just kind of have to do something about it.
Children who have received surgery through his efforts have sent pictures to say thank you.
But Nathan worries that with modern technology and social media, it is harder to escape the bullies.
The main message I would give to children who are suffering from bullying, is never to listen to bullies in the first place, although that is difficult. But also to manipulate that negative energy towards something positive and just make the best of their lives.
Nathan has suffered dozens of painful surgeries on his nose and mouth over the years.
But it was the bullying that caused him most pain.
The challenge will take place soon after one of his last operations and it will also mark the final year of his surgery journey.
Nathan joined our presenters Fred Dinenage and Sangeeta Bhabra in the studio: