For many completing an event like the London Marathon is a huge lifetime achievement - but now an even bigger challenge has been set.
The London Classics is a new medal that will be awarded, if a participant manages to finish the capital's virtual Triathlon - being the Marathon, Ride London, and Swim Serpentine.
The two-time Olympic gold medallist Heather Stanning OBE will be one of the first to try to complete it.
The first chance for people to complete the London Classics comes at this year’s Swim Serpentine on Saturday 16 September with the introduction of the new London Classics two-mile swim. Anyone who has completed the London Marathon since 1981 and cycled the Prudential RideLondon-Surrey 100 since its inception in 2013 is eligible to enter.
Everyone who completes this iconic trio of events will receive a specially-designed London Classics medal and will be listed in the London Classics Hall of Fame.