The fittest cities in the U.S. don't all have balmy weather year-round; state-of-the-art, celeb-packed gyms; or legions of super buff locals strutting around in size 4 jeans. What they do have is a commitment to public parks and bike lanes, and active citizens with low rates of obesity, smoking, and chronic illnesses, like heart disease, diabetes, and asthma. To find these fitness hot spots, Shape partnered with the American College of Sports Medicine for its annual American Fitness Index (AFI). "This is our way of figuring out what the major metropolitan areas are doing right to make people fitter and healthier," says Walt Thompson, Ph.D., the AFI advisory board chair and professor of exercise science at Georgia State University.

Washington DC