[strken]

I saw a huge difference when I moved from a tiny rural town to a city. I grew up comparatively close to a decent-sized town, in that it was a 20 minute bicycle ride or more than one hour walk to the nearest supermarket, but in the city I found that there was usually a supermarket within a 15 minute walk. In the country my parents had to drive to everything except the pub and playground, and deliberate effort was required to get more exercise.

This depends on how walkable your cities are, of course.