Initially, I was concerned that he might be one of those trainers who chuck heavy balls at you in the rain. Nothing of the sort. He just gave me some exercises. Bum twitches, mostly. I had to learn to tense each cheek separately, which gave sitting at the computer a new, interestingly kinky element. Then leg raises and some horrible twisty sit-ups. ‘Do them if you want,’ said Tim. ‘It’s up to you.’ What he was doing was building up my bum and stomach, so that, when I did run, it would be these, rather than my Achilles, that would be doing the work. And he was building up my exercise persona in a realistic way, giving me exercises that would take 15 minutes, rather than an hour. Even I could fit those in.