The Dutch swimmer won gold in Beijing, having been diagnosed with cancer seven years earlier.We hear why he decided to stop competing, and instead turn his attention to charity fundraising - setting up his own foundation and raising millions for cancer research through long-distance swimming endurance events.And how he ensures that the money raised is correctly managed.Produced and presented by Matthew Kenyon.(Image: Maarten van der Weijden setting a new world record in 2021, by swimming continuously against a current for more than 31 hours and 7 minutes. Credit: Getty Images)

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