America's Obesity Crisis:Exercise: The Walking Cure

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Another major goal of active-living proponents is to change the raft of zoning regulations, local ordinances and building codes--most of them adopted after the first great wave of post--World War II suburbanization--that were explicitly designed to discourage denser development. Very often those rules clearly forbid mixed-use areas (residential and commercial in the same neighborhood, for example), which would bring people within walking distance of a store to buy a quart of milk. And until we change how America is built, how Americans are built will be a continuing problem. --With reporting by Kathie Klarreich/West Palm Beach and Steve Korris/Columbia

Watch Good Morning America on Tuesday, June 1, for more on how communities promote walking