Fit Sugar is truly impressed with the new cross-training Lance Armstrong. He wanted to run the NYC Marathon in under 3 hours and he did it! At the finish line, however, he admitted it was harder than anticipated and although he did some training he was surprised by how difficult it was.
Fit is all about setting goals and figuring out how to reasonably meet them - you don't need to start off with a marathon. If you're interested in running but need an end goal to work toward, have you thought about doing a 5K race? Cool Running created a program for the novice runner - The Couch-to-5K Running plan. They site says:
Too many people have been turned off of running simply by trying to start off too fast. Their bodies rebel, and they wind up miserable, wondering why anyone would possibly want to do this to themselves. You should ease into your running program gradually. In fact, the beginners' program we outline here is less of a running regimen than a walking and jogging program.
Sounds like a perfect start to me.