Joby Ogwyn
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Joby Ogwyn in practice jump ahead of Mt Everest leap

27 February 2014 Last updated at 09:08 GMT

Daredevil Joby Ogwyn has been explaining his reasons for attempting to jump off the top of Mount Everest in May.

The American wingsuit jumper described it as a "real adventure" but admitted he has had "real doubts" about the project.