"Traditionally" the people of Osaka, Sicily and various Greek islands are actually best at maintaining such healthy lifestyles, from what I recall from studies on longevity. Good diets, lots of mild exercise from long walks (on hilly terrain) and strong socal ties. I say traditionally because of course these studies can only really look at the lifestyles of past generations.

With that in mind the flat landscape of the Netherlands might be giving us a slight disadvantage ;)