Two extraordinary people will be among more than 10,000 men and women running the Brighton Marathon on Sunday.
He calls it "joggling" - running and juggling at the same time - and Kevin Williams plans to do it for the entire 26 miles of the Brighton Marathon.
All the more amazing considering that five years ago he suffered a massive brain injury after a fall. He awoke from a two week coma with no idea who he was.
The damage to his brain was so severe, Kevin had to relearn to live from scratch. His only asset a basic muscle memory.
We caught up with him training on Brighton seafront. You can sponsor him here.
Amanda Chalmers was born with cystic fibrosis and will run the Brighton Marathon less than two years after undergoing a double lung transplant.
The 26-year-old University of Brighton graduate could hardly walk up the stairs before her life-saving operation in September 2012. She'll be raising money for the Cystic Fibrosis Trust.
We caught up with her while training in nearby Preston Park. You can sponsor her here.
As the Brighton Marathon was taking place last year, Andy and Emily Squires from Hove had just been told their 8 month old son, Thomas, had meningitis. As they watched the race from the hospital window, they vowed that whatever happened, they'd take part in this year's event.
Another chance to see this report by Charlotte Wilkins.