Third-fittest city in America: Portland, Ore.

Maybe it's the fact that Nike ( NKE) has headquarters nearby, but 54.7% of Portland residents report being at least moderately active -- well above the study's 48.7% average.

Oregon's largest city also has a relatively low number of smokers, as well as a below-average rate of death from cardiovascular disease.

Additionally, Portland offers health-conscious residents a higher-than-average per-capita number of baseball fields, dog parks, golf courses, farmers' markets, public parks and tennis courts.

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