My wife was in a car accident last May that totaled my car. Being that gas prices were what they were and our finances had issues due to my wife being unemployed, I tried using the bike and a bus to get to work.
It worked wonderfully. 1 year later: 2 more bikes, a ton of gear, cycling clothing, and almost 30lbs lighter.

The possibility of loosing enough weight to go outside without my shirt was the main reason I kept going. Now I'm addicted to it. Just started riding 60 miles a day.