I love surfing, rock climbing, cycling - all that stuff. But it's just amazing that I can inspire people with my running. It's humbling, really.

I wasn't born with any innate talent. I've never been naturally gifted at anything. I always had to work at it. The only way I knew how to succeed was to try harder than anyone else. Dogged persistence is what got me through life. But here was something I was half-decent at. Being able to run great distances was the one thing I could offer the world. Others might be faster, but I could go longer. My strongest quality is that I never give up.

I've raced on all seven continents at least twice. I've probably run thousands of races. But the single race that I'm most proud is a 10K. Yes, a 10K. I ran it with my daughter on her 10th birthday.

How to run an ultramarathon ? Puff out your chest, put one foot in front of the other, and don't stop till you cross the finish line.

A lot of ultramarathoners are soloists. They're single and live lives off the grid.

I do a lot of marathons as training runs. If I'm somewhere and there's a marathon, I'll sign up and just go run it.

Once you permit yourself to compromise, you fail yourself.