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Running is what keeps my weight down. I have to stay active or I could easily gain weight.

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.

I honestly don't diet or work out regularly. I'm just always running around - you'll never catch me having a day on the sofa.

I run six-to-eight miles a day, plus weights and aerobics in the lunch hour. I also lie a lot, which keeps me thin.

I was an athlete, so I have kind of an athletic sensibility towards writing. I can work for many long hours without fatiguing.

Running is a way for me to relax. With one hour of intense running, I can get a lot of physical exercise. I can relax my body. I feel a tension in my muscles when I don't run. In that sense, I need to get out a few times a week in order to do my work as a scientist, which involves a lot of sitting still.

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

Outside of a couple of times I ran without eating right or being too tired, I always feel great after I run.

Running gave me a focus to start looking after myself, to eat properly, and focus on building up my strength.

I've always liked to run. I did it from a conditioning standpoint, you know. I really enjoyed running, and I do it to stay in shape.