OK, this is going to sound a little hypocritical, as I have hard-recommended every activity and pursuit, every wellness wheeze and rejuvenation exercise the modern world has dreamed up. Try hot yoga: it plugs you back into your inner child. How about a morning rave? All the cardio of a regular rave, none of the ecstasy: what’s not to like? Botox? Fine, it’s plastic surgery-lite, but also it makes you look much more friendly. Pilates, cycling, running, high-intensity interval training, Tough Mudders, barre, aerial silks, horse-riding: at some time or another, I have insisted to anyone who will listen that it’s only their failure to incorporate, say, a horse into their weekly schedule that is standing between them and their best self.

But there is a dark side to wellness, which I always, for shorthand, thought of as political: getting fit makes you more rightwing. The mechanism is incredibly simple: you embark on this........

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