Don't look down! London runners stretch their legs 16 floors up

Workers pose as they run round a track, unveiled as the highest running track in London, at the White Collar Factory in the 'tech belt' hub near Old Street in London, September 5, 2017. REUTERS/Toby Melville TPX IMAGES OF THE DAY

LONDON (Reuters) - Athletes risked vertigo on Tuesday at the launch of London’s highest running track, 16 floors above the capital's streets.

"It's incredibly exhilarating running at that height, with panoramic views in every direction," said Benjamin Lesser, an amateur marathon runner who works for one of the developers of the building topped by the track.