I think that depends on the grade. In more hilly terrains... I think walking might burn more. I remember reading a LOOONG time ago, that a person will burn a l

I think that depends on the grade. In more hilly terrains... I think walking might burn more. I remember reading a LOOONG time ago, that a person will burn a lot more if their metro stop is Lamarck-Caulaincourt than they will if their metro stop is Odeon. So I could see walking around ... say ... Duke University probably burning a lot more than walking around Rice University. And walking around the University of Wisconsin at Madison all day will be a workout unto itself most likely. I don't think it is just... if you're walking you are not exercising. I think it really depends where you are walking at. Maybe even depends on if you have a backpack or heavy side bag as well. I'm not sure you can make a hard and fast rule.