Someone mentioned "our jobs being of the sedentary variety", which I think is a key point. I sit in front of a computer or in a meeting most of the time at work. I try to avoid using the phone if I can walk to the other side of the building instead, but that's all the exercise I get (except for my hands typing, like right now!). Between work, the burdens of being a homeowner (something always needs to be fixed!), and wanting to spend time with my wife and 4 year old twins, there isn't much time left for exercise. I already feel guilty when I take time away from the kids to get projects done around the house and property. I live in the country and it's 16 miles to work (one way), with most of it being along narrow winding country roads, or roads with no shoulder where people drive 50 to 60 MPH. So far, I just haven't had the guts, or maybe I just haven't been dumb enough, to take my chances out there! By the way, no one else around here has either, since I never see anyone cycling to/from work, the only cyclists I see are in the evening after traffic dies down.