We did a city-break to Lisbon recently, and we didn't see one fat Lisboner. The place is all hills and everybody gets plenty of excercise! The only fatties we saw had just got off a cruise ship, and the only mobility scooter had a massive Lancashire lass onboard. (Some didn't even get off the ship- just looked at Lisbon from the top deck restaurant!)Hardly surprising with all the clips you see waddling around these days.
It amazes me how some people think a twenty minute walk is too long and would rather get in the car.