I said that the stair climber and climbing stairs were the same—but they are not. In fact, climbing up 100 stories is easier than the equivalent distance on a stair climber. Does that seem crazy?

As expeditions go, it was a gruelling one. In just under 23 hours on 3 September 2021, Sean Greasley climbed and descended 8,849 m (29,032ft) – a distance that would have taken him to the top of ...