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Marathons are good training goals.

What I think a lot of great marathon runners do is envision crossing that finish line. Visualization is critical. But for me, I set a lot of little goals along the way to get my mind off that overwhelming goal of 26.2 miles. I know I've got to get to 5, and 12, and 16, and then I celebrate those little victories along the way.

Many run primarily for the exercise, but others run to condition themselves for well-publicized races of various distances.

As a scientist, I play in the top league - the Olympics, the World Championships - and I want to be in the lead. As a runner, I set personal goals, and I want to push beyond my own personal limits. I was very happy when I practiced for several months and then reached my goal to run a marathon in 2:50.

Running is a great metaphor for life. You set a goal, and then you get to work. How well you do is a direct reflection of how hard you work. It's a mental game, too. There are setbacks along the way, but the true test of a runner is how you overcome and push past them.

In those long, lonely miles you put in during the off-season, and in those knife-in-the-gut track repetitions and hill repeats that buckle your knees - at that moment in almost every race when you ask yourself how much you're willing to hurt to catch one more runner - you can draw strength and inspiration from your running mates.

Runners exalt the marathon as a public test of private will, when months or years of solitary training, early mornings, lost weekends, rain and pain mature into triumph or surrender. That's one reason the race-day crowds matter, the friends who come to cheer and stomp and flap their signs and push the runners on.

I set myself some specific goals, but the key one is just getting myself into as good a shape as possible for one day this year: the Olympic marathon.

It's about having an active lifestyle, staying healthy, and making the right decisions. Life is about balance. Not everybody wants to run a marathon, but we could all start working out and being active, whether you walk to work or take an extra flight of stairs.

In the marathon a crazy athlete can just keep pushing from the beginning, at a championship you don't need a time just to win the race.