What we've done all of these years is very simple, is use the little tool, which is ask three whys in a row. Because the first why you always have a good answer for. The second why, it starts getting difficult. By the third why, you don't really know why you're doing what you're doing.

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 come from the generation who were taught never to throw things out. I like the idea of hanging on to things and repairing items rather than discarding them. It’s not a question of money, more to do with guarding resources and not being wasteful. My children laugh at me when I sit darning a pair of socks.

And this is my only pair of pants. These three glasses, I don’t even think about it because I just think about having enough.

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.