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The triathletes pushing Ironman to the limit

In 1954, Roger Bannister broke the four minute mile. In 2019, Kenya鈥檚 Eliud Kipchoge ran a sub two hour marathon.

But what鈥檚 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鈥檚 Katie Smith has more.

Photo: Lucy Charles-Barclay celebrates winning an Ironman (Credit: Getty Images)

4 minutes

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Not by the Playbook

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