I've seen extreme bravery from the least likely of people. Life is about the moments when it's all gone wrong. That's when we define ourselves.

I've never really had a TV career. I've been a soldier and a climber.

Once a job it has begun, do not stop until it's done. Whether it is big or small, do it well or not all.

I exercise about 40 minutes a day, and I'll run one day and do circuit training the next day. I live in an area where there are brilliant hills and mountains, so I get a good hill run with my dog. At home, I'll do the circuit training with old weights, along with pull-ups in the trees and that sort of stuff.

Don't be scared to dream big, and don't be afraid to be close to people. And never give up! It's the tenacious not the talented that win.

The extremes of jungles, mountains, and deserts are inherently dangerous places.

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.