Basic transportation. Town was far enough away that a bike ride was a good workout, but close enough it was too tiring. I kept at it for a long time, even after I go tmy driver's liscense, until a job kept me away by demanding my attention for up to 14 hours a day.
Back in early 2000, I found myself living in a place with tons of bikepaths, and a company with a bike rental department in need of a shop supervisor. I applied, and got the job. I then bought a cheap bike from Toys 'R' Us, which I replaced with a better bike from an LBS, then I bought an old road bike and kept riding. A move away from work has kept me from commuting, but I ride as much as I can, even taking to Spin classes in the colder months.