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In 1954, Roger Bannister broke the four minute mile. In 2019, Kenya’s Eliud Kipchoge ran a sub two hour marathon. But what’s left to test human endurance? British triathletes Alistair Brownlee and Lucy Charles-Barclays are attempting to accomplish something that has never been done before in the world of Ironman. Sportshour’s Katie Smith has more. Photo: Lucy Charles-Barclay celebrates winning an Ironman (Credit: Getty Images)