As for my diet, I try to eat lean, clean and healthy - nothing too surprising. And I avoid too much meat or dairy because they slow you down.

Are you the sort of person who can turn around when you have nothing left, and find that little bit extra inside you to keep going, or do you sag and wilt with exhaustion? It is a mental game, and it is hard to tell how people will react until they are squeezed.

I do see a lot of the hard end of ecology, and my feeling is that we live on a super-exciting planet but a super-fragile one.

The greatest journeys all start with a single step.

Our achievements are generally limited only by the beliefs we impose on ourselves.

Americans are cool, if you show just a chink of vulnerability, they respond so much. They'll pat you on the arm and say, 'Hey kid, you're all right'. Brits will respond but they are much more cynical.

The lesson is, the rewards in life don't always go to the biggest, or the bravest, or the smartest. The rewards go to the dogged; and when your going though hell, to the person who just keeps going.