All BS written by a leftist person trying to put a scientific spin on their BS. Sure setting a car isn't exercising but so what? Most people don't exercise anyways! And besides the average commute is 20 miles one way, I doubt any of you here except maybe one would want to commute 20 miles to work and 20 miles back stretching your 9 hour work day to 12 or 13 hours. Add on top of that most of America lies in a cold belt which eliminates the possibility of riding 20 miles to work in the snow!! I'm lucky I'm only 4 miles from work, but what about those that commute 50 miles to work? Yeah, complete and utter nonsense from some leftist, I guess in the ideal world where everyone just drives no more than 5 miles and with beautiful year round 70 degree averages then it would make sense, but most Americans that simply isn't true.