But "walkable cities" can overdo that. I live in big European city, do not have a car, and I work from home, and I have most of the places that I need to go to (grocery store, dry cleaning, dentist's office, pharmacy, restaurants, etc) within half a mile radius, which means I average like 3500 steps per day, having no need to go any further.

17000 steps is what I did on my vacation in Lisbon, when I did A LOT of sightseeing. Can't imagine walking that much in my home city.