Three British cellists will run this Sunday's London Marathon with their cellos strapped to their backs. Clare Wallace, James Rees and Jeremy Dawson are aiming to raise £10,000 for spinal cord injury charity Aspire. The trio, known as the Extreme Cellists, has performed a range of other challenges, including the Sheffield Half Marathon in 2009 and a tour of English cathedral rooftops in 2006.

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