Caroline Lyons in the AlterG, an anti-gravity treadmill, at the Muscle Clinic in Clontarf, Dublin 3, with its clinic director, Pat Byrne. Byrne wanted to make the machine accessible to so-called ‘normal’ people rather than just the sporting elite. Photograph: Alan Betson
Take the weight off

Back in 2008, word spread in US athletic circles that Nike was using new Nasa technology to train its sponsored athletes like Mo Farrah. The “AlterG” (...)