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I have been through various fitness regimes. I used to run about five miles a day and I did aerobics for a while.

I used to run ten miles every other day and eat very little. I was living in London on my own for the first time and no one was checking on me. I wasn't anorexic but lost three stone. I weighed around seven. It lasted six months until I ran out of willpower.

I've been a runner a long time. When I first got into it, I started doing small triathlons in Chicago, and I just did it to get in shape. When I got out of college, I put on a few pounds like everybody does. I did it when I was in my early 20s, but I never really did any long runs.

There are many, many people who have lost 100 pounds and kept it off.

I put my body through hell. I run 120 miles a week, week in, week out.

You imagine running 120 miles a week, week in, week out, for the past four or five years. It takes a little bit out of you.

You have to run 75 to 100 miles a week if you expect to break the four-minute mile.

I was exercising so hard that I began to lose weight.

When I ran across America, for 75 days I ate 10,000 calories a day. I still lost about five pounds.