More importantly, they not only walk far to work, and not only do they cycle to work, but they cycle for work, as you can see here.

Instead, if your friend's idea of recreation is physical activity, bowling, or playing hockey, biking or gardening, if your friends drink a little, but not too much, and they eat right, and they're engaged, and they're trusting and trustworthy, that is going to have the biggest impact over time.