An annual survey by Men's Fitness magazine ranks Seattle as the "fittest city" in the US. Honolulu, Colorado Springs, San Francisco and Denver rounded out the top five. The magazine each yar compares 50 cities by weighing factors, including fast food restaurants per capita, TV watching, air quality and parks. In Seattle, for example, sporting goods stores and gyms outnumber fast food joints. Houston was named the "fattest city" for the fourth time in five years, followed by Philadelphia, Detroit, Memphis and Chicago.