I bike pretty much everywhere I can so that I can eat cheeseburgers and enjoy beer.  Killer legs are a bonus reward for all of my work. An old friend from school and i were talking about fitness this past summer.  She was moaning about her lack of drive to get to the gym and i suggested biking.  It's a free activity beyond the initial investment of a bicycle and helmet. It's not regimented by a schedule or facility and it provides a moving scenery for those of us with short attention spans.    She sighed and complained that it was too much work to ride now.  After all, she's totally out of shape.