Endurance sport: Why people push their bodies to extreme limits
Five people who complete long-distance swims, cycles and runs tell us why they do what they do. …
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Ultra-marathons, Channel swims, and extreme triathlons are feats of endurance for the body and mind.
We speak to five people who take part in long-distance or extreme sport to find out why they do what they do in spite of the relentless training and threat of injury.