To get ready to climb Everest, I did a lot of hill running with a daypack on and a lot of underwater swimming. I would swim a couple of lengths underwater and then a couple above. It gets your body going with limited oxygen.

And Jesus, the heart of the Christian faith is the wildest, most radical guy you'd ever come across.

My faith isn't very churchy, it's a pretty personal, intimate thing and has been a huge source of strength in moments of life and death.

All worthwhile journeys have big obstacles. It's the way of the world. The rewards go to those who can push through those trying moments and still manage to keep a smile on their face.

I don't like expeditions where it is a total lottery whether you live or die. You have to keep those sort of good luck cards for rare occasions!

Many great people over the centuries have depended on their faith- it is a sign of great strength to need Jesus in your life.

For me, my training is a key part of my work as so often my life has depended on being able to move fast and haul myself up and out of something fast!