Michael Crawford

I really didn't realise until I got back the work that goes into a performance. You're like an athlete - if you haven't been practising things tighten up. I had to do a lot of practice work, but I got through it. Even when I was 21 I would have a 40-minute nap on the day of a show, and I will still do that.

In 2004, I was on the West End stage in The Woman In White, and for every show I had to climb into a fat suit to play the obese Count Fosco. It was hard work, and unbearably hot, but I sailed through because I'd always kept myself fit.

I'd be totally exhausted by mid-afternoon, and I could barely climb the stairs at home. It was particularly alarming because all my life I'd enjoyed doing all my own stunts in shows, taking on every physical challenge. Yet suddenly, I'd become like a very old man. I knew something was wrong, but I had no idea what.

To ask questions can become the laziest and wobbliest occupation of a mind, but when you must yourself answer the problem that you have posed, you will meditate your question with care and frame it with precision.