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The Nike Fuel Band is interesting - it measures your movements and how far you've walked and how hard you've worked that day. I prefer using when I travel. It's a fun way to see how far I've walked - how many steps I've taken when I'm walking around different cities.

Millions of us track ourselves all the time. We step on a scale and record our weight. We balance a checkbook. We count calories. But when the familiar pen-and-paper methods of self-analysis are enhanced by sensors that monitor our behavior automatically, the process of self-tracking becomes both more alluring and more meaningful.

I wear a pedometer, aiming for five miles a day - don't be too impressed; that includes walking around my house and food shopping.

Anything that's slightly dangerous and gets the heart rate going is my kind of workout.

To look and feel my best, I watch my calories and exercise.

I wear a continuous glucose monitor when I'm racing.

I actually read somewhere that they measured how many calories you burn from watching movies, and horror movies are way, way up the list.

For many years, I was obsessed about what I was eating, how many calories it had, and how much exercise I'd have to do.