When I was in the first year at middle school, in Miss Hale’s class, my parents returned from a parents’ evening looking disappointed. My nine-year-old self picked up on this. It wasn’t my schoolwork: that was OK. It was that the teacher had revealed that in PE I was the only one in the class who couldn’t do a forward roll.

This was true. It wasn’t that I was physically incapable – I was in the school football team and, without wishing to boast, probably the ninth-quickest runner. I just had this mental block. I couldn’t bring myself to do it. The idea of the world momentarily going upside down was too much for me. The prospect of such disorientation was unbearable. If only Miss Hale had taken me to one side and said: “Look, you’re overthinking this – and, believe you me, if you let it, overthinking will blight your life.” But she didn’t, because teachers........

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