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Steve Backshall is one of our leading natural history broadcasters; he's also an extreme sportsman who has conquered some of the world's most dangerous mountains. Despite suffering a severe rock-climbing injury in 2008, he continues to set himself extraordinary challenges.

For One to One Steve meets two other extreme adventurers to discover what drives them to significant levels of danger and physical discomfort in order to complete challenges that are almost superhuman.

In this first programme he meets Ed Stafford. Ed was the first person to walk the entire length of the Amazon River - 6000 miles over two and a half years. Ed acknowledges that explorers have a 'chink in their armour, an insecurity, a fear of something in life... Doing something tangible, something remarkable, enables you to prove yourself'.

Producer: Karen Gregor.