Reasons I Cycle:
I live where almost everything I need is within walking and cycling distance (half mile to 3 miles).
When I don't telecommute, I usually cycle to work (depending on project/assignment, 7-14 miles each way).
My hybrid is equipped with fenders and I have rain gear, so weather rarely prevents me from riding.
My spouse and I share one economy car between us, and it usually takes 2-3 weeks to go through a tank of gas.
Healthful, Inexpensive Recreation:
I usually do a long-ish pleasure ride on the weekend (35-75 miles), on my own or with a group.
On a good week, I squeeze in a midweek pleasure ride (25-30 miles).
I occasionally participate in organized centuries and other rides.
Defiant Age Denial:
I used to run competitively, and cycling is part of my cross-training lifestyle that allows me to maintain the level of fitness I desire as I get older.