British explorer Lewis Gordon Pugh has swum across some of the most challenging stretches of icy water in the world, wearing only a swimmingcostume, hat and goggles.
As a regime it could help you forget most things - you venture into the icy night in swimmingcostume, psyche yourself up for a few minutes in a shallow outdoor hot-water pool on the dockside, run the 100m or so to the sea and then plunge in, screaming.