We should distinguish between 1) a 30-45 minutes of walking in an ordinary day, which I agree that people in well-urbanized areas routinely do, but suburbs don'

We should distinguish between 1) a 30-45 minutes of walking in an ordinary day, which I agree that people in well-urbanized areas routinely do, but suburbs don't; 2) an intentional 30-45 minute recreational / for-exercise walk, which a) some, but not enough Americans (and, I suspect, smug Europeans, if they're honest; full disclosure: I don't) do anywhere near every day, and b) many urbanites will drive / take transport somewhere to do, but is (ironically) easier out-the-door on your average suburban streets; and 3) a one-way 30-45 minute journey on foot to some particular place. I took GP to mean the last of these, which I think is uncommon, even in cities (I mean, public transport is right there, right?)