Long years ago, sometimes it seems many lives ago, I was at Oxford listening to the radio programme Desert Island Discs with my young son Alexander. It was a well-known programme (for all I know it still continues) on which famous people from all walks of life were invited to talk about the eight discs, the one book beside the bible and the complete works of Shakespeare, and the one luxury item they would wish to have with them were they to be marooned on a desert island.

One thing that I did was race against the British men a lot and they used to push me round the road; they used to make my life really hard but then when I was racing against the best women in the world, I'd been through just about every experience you could imagine. I remember this one race – a half marathon – where my husband literally pushed me into every kerb he could find, he pushed me into every corner, you know, messed around and tried to drop me out the back of the pack. Then when you're in a race that really matters, if that happens, you've got the skills to deal with it… you need to have practised everything you possibly could in the lead up to it.

I love to entertain. I'm not sure every player sees it that way, but I love the performance aspect of it—to be able to entertain people week after week. Some of the happiest times in my life were spent waiting in that hallway in Melbourne, and walking out into Rod Laver Arena with my earphones in and trying to stay focused and drown out the noise but still feeling the energy of the crowd.

I love going to the tip. A friend reassured me once that if I ever get cancelled, I’ll still have the tip, and she was absolutely right. Even Britney Spears has the tip! It’s never going anywhere, and that’s a nice thought.

Sleep has to be, by far, the most underrated aspect of good health. I think sleeping less & working more is glorified. Life is like a marathon; if you run too fast and don't pace yourself, you can burn out, and you probably won't be able to finish strong.

Sleeping by 9 pm & getting a workout at 5 am has been helpful. Sleeping early reduces the chances of bingeing when we are drained and have low self-control at the end of the day. A workout in the morning also increases the odds of making healthier choices throughout the day.