James Boardman is partly doing the British Heart Foundation ride in memory of his dad.
BBC News
"There was always talk that I would have to have a valve replacement, but when it actually happened in my 30s it was quite a shock," he said.The off-road challenge starts on the Thames Cycle Track on 23 September and takes riders on a mixture of tracks, including grass and gravel, before ending in Hove.
"After the surgery I couldn't take being knocked about at karate, but I still managed to carry on cycling," he said.
Danmark Seneste Nyt, Danmark Overskrifter
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