I knew I wanted to be a professional triathlete, but I didn't know it was possible until I won the junior champs. My dad said I should give Cambridge a go to see if I could do both, but it was only ever a trial.

My school career was absolutely crucial to me. As an endurance athlete, some of the most important years are maybe when you are 16, 17, and 18. For me, getting that right was very important, and my school allowed me to do that.

We are quite different: I'm relaxed, and I get ready for races really late, whereas Jonny is really organised and punctual. I like to lead from the front in the run, whereas Jonny might hold back. Maybe it's because I'm the older brother, but I don't think there is a mental block that stops Jonny doing the same. I just think I'm a bit more gung-ho.

My first event was in Nottingham, aged 11, and the prize was a bike. I thought, 'Wow.' I had no idea what to wear. I think I did it in swimming trunks, then just put on a T-shirt and shoes for the bike part. Triathlons felt exotic. There was a technical and tactical aspect to it as well as the endurance challenge. I was hooked.

If I can get people to accept that a DNA test is nothing to be intimidated about, then we can do tests that determine how well you metabolise certain drugs and test for breast cancer.

Women know the financial, social and physical costs of not having access to basic health care.

I try and maintain a little bit of fitness, man.

What I do now is I train in the mornings, and people ask me why I do it. I do it for two reasons: first of all, to keep in shape, but secondly, I think training, sport, and physical activity is really good for mental health.