Fancy a swimming/running fitness challenge for 2014? The Swimmer is a relaxed half-marathon journey from north to south through London’s finest pools, ponds and parks. They start at the natural ponds at Hampstead and finish at Brockwell Lido, stopping to dip in Parliament Hill Lido and the Serpentine. The run takes in Hampstead Heath, Parliament Hill, Primrose Hill, Regent’s Park, Hyde Park, Battersea Park, Clapham Common and Brockwell Park. More details at www.theswimmer.org.