All's fair in love and war and sport - even when you're fighting against your sister.

I read a statistic that in horse racing, the favourite only wins 12 per cent of their races. I'm not comparing myself to a horse or saying I'm the favourite - although my sister would say I can nag an awful lot - but nothing is guaranteed in sport. Anyone can step up and take what you perceive to be your place in the final.

No one likes to get beaten, even if it is to your best friend.

At the Olympics, you have almost nothing to lose, but at the Olympic trials, you have everything to lose. You have the last four years of your life to lose.

If you age with somebody, you go through so many roles - you're lovers, friends, enemies, colleagues, strangers; you're brother and sister. That's what intimacy is, if you're with your soulmate.

Choosing between the 50 m and 100 m is like choosing between your children. I have favourites on different days.