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.
More top news
Tuesday's weather for the west of the region
Tuesday's weather for the east of the region
The government is consulting on proposals to introduce an hourly fast train in parts of the south east - not stopping at some stations