The American Fitness Index has been released by the American College of Sports Medicine (ACSM), complete with sexy interactive graphics; San Francisco is first, Seattle is second, Boston is third. (complete list is below the fold)
And, to nobody's surprise, if you compare it to Kenny's list of the most walkable cities in the US, there is significant overlap; in terms of walkability, San Francisco was first, followed by New York and Boston. ::American Fitness Index
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