A step up – what is it like tower-running up a 35-storey building?

More than 100 people took part in an event at the City of London’s Broadgate Tower – with some brave souls attempting 12 climbs for a vertical mile
Running up a seemingly endless flight of steps in a brightly lit, white-walled stairwell, I felt as if I was trapped in a psychological thriller. Muffled sounds of heavy breathing and disembodied voices drifted down from above, while from behind me I could hear someone’s footsteps getting closer.
I was climbing the 877 steps of the