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A male runner smiles as he holds his Marathon medal.

Take on a challenge

With your challenge, you’ll help support people affected by inherited sight loss to lead better lives today and accelerate the search for treatments for the future.

The Big Half 2024 – London

The Big Half is back for 2024! The vibrant, inclusive half marathon with a fun, festival atmosphere sees thousands of runners take on the 13.1 mile course through London, from Tower Bridge to the iconic Cutty Sark in Greenwich.