In the whole of my career, there were very few training sessions that I missed. Even when I was pregnant, I trained all the way through. I was back training when my daughter was two weeks old. You've got to commit to this, because it can be really easy to walk away from the track, convince yourself, "Oh, well, I'll do it tomorrow, I'll catch up". You can't and what I say is it's all pennies in the bank. When I say that to my daughter, she rolls her eyes at me, but you put a couple of pennies in every day and when it matters, then you've got this bank to call on, as opposed to you can't stick them all in two weeks before.

Remember, if you sit at your desk for 15 or 20 years, every day, not ­counting weekends, it changes you. It just does. It may not improve your temper, but it fixes something else. It makes you more free.

We need to have mentors. I think I've always been pretty shameless about seeking out people much smarter and much more experienced than me from the very beginning. Michael Seibel and other people. And the more successful I got, the more leaders I started seeking out, whether it was investors, or Sheryl Sandberg at Facebook, or I got the opportunity to spend time with Warren Buffett and he became a close mentor of mine.

I think chess — actually, a number of things that I learned when I was young — it wasn't so much the chess itself; it was the skills that you were training while you were playing chess. So problem-solving, imagination, creative thinking, strategic thinking, all of these things — if you play chess to a high level, what you're really honing is those meta-skills. And I realized from quite young, that's one of the reasons I liked chess was this is a great practice for me to get good — sort of like a mental gym, if you like — to get really good at those other skills, which you could then translate to all sorts of other subjects like science or business.

I think I'm trying to be as normal as possible, as authentic as possible, and I always try to stay the same way for as long as possible,

As many of you know, the past three years have presented me with challenges in the form of injuries and surgeries. I've worked hard to return to full competitive form. But I also know my body's capacities and limits, and its message to me lately has been clear. I am 41 years old. I have played more than 1,500 matches over 24 years. Tennis has treated me more generously than I ever would have dreamt, and now I must recognize when it is time to end my competitive career.