Preparing for the expected is only one part swimming an open water ultra, there is also the unknown. “I’ve never swam that long before, so anything can happen,” he says. But the unknown is exactly the part he loves about open water swimming. "Every swim is different, isn't it? You can’t predict what's gonna happen. At the end of my Bristol channel, I had dolphins swimming around me and it was amazing…You get so many different elements and it makes it exciting and less boring. It does also make it more mentally challenging,” he says.
No matter how prepared and capable a swimmer is, during an ultra it’s a certainty to run into difficult moments. “When it gets hard, a lot of the time in the last swim, I thought about the reason why I was doing it and that sort of pushes you along. It helps as well knowing that your family's gonna be there at the end—my little boy will be there at the end. It all sort of drives and helps you push through.”
Gilson credits his mental toughness to his swimming years. “You have to be prepared to put in the training and the work and, if I hadn't been a swimmer before, training for an ultra event, well, I don't think I would...Swimming gave me the mindset that when things are tough, you can push through. I think that's for general life as well and I think not to be taken for granted.”
He references his son: “We had loads of different advice from doctors and pediatricians. Because it looks very much like autism—we would've accepted that—but we just knew it wasn't. So we just had to keep pushing for answers. We could have just accepted the general concession from the doctors, but it was looking for those other answers and thinking outside the box a bit. We did manage to find the solution and maybe we wouldn't have done if we just accepted it. I don't know where my son would be now if we had.”