The Dart 10k is a 10km river swim along the river Dart in Devon. This will be the furthest I've ever swum, and I estimate it will take over 5 hours. It’s the same as 400 lengths of a regular pool. It's no small thing. It's a bit scary.

I'm doing this to raise money for Level Water, a charity who provide swimming lessons for disabled children because everyone should be able to enjoy being in the water.