Hampstead Heath began swimming outside after a dip on Sarah Foot . Now goes for regular dips in the bracing 8C waters of the North Sea . Says nothing beats the 'silky smooth ' feeling of swimming in cold water .
Sarah Foot began swimming outside after a dip on Hampstead Heath . Now goes for regular dips in the bracing 8C waters of the North Sea . Says nothing beats the 'silky smooth ' feeling of swimming in cold water .