I have very few friends who could plausibly be described as gym fanatics. But I do have one in London who has been working out with weights since he was 14, up to six days a week, most recently at a nice health club that costs him £30 a month, thanks to a corporate discount.

He’s in his early forties, and when he told me last week he had cancelled his membership and was never going back, I was shocked...

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