Photographer David Clifford has captured the world's most dogged runners doing what they love in the most remote and unforgiving environments.
Nemesis Sub-Terra, Alton Towers, UK
Alton Towers' newest ride already has an unusual claim to fame - it's the first time a theme park has brought in examiners from the British Board of Film Classification to provide an age classification for a ride. The decision? Nemesis Sub-Terra warranted a 12a certificate.
Unsurprisingly those behind the ride are keeping the finer details under wraps until it opens this weekend, but when The Independent's travel supremo Simon Calder got a sneak preview, the heart-monitoring devices he was wired up to showed that his pulse jumped from 60 to 172 in the space of a few seconds. Think you could stomach it? Read on for our pick of the world's most hair-raising rides including Tokyo's infamous 'vomit-comet'.
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No they are controlled by a second set of rails which controls how the seats are positioned.
Did a chimp write this?
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