The fitness director of New York's West Side Y and a journalist sidekick who loves to run formulate the Run-Easy method that they say will turn us all into happy, fit, sexy people. There are exercises for the warmup--15 minutes of stretch and groans to loosen up tight muscles--for the actual run, and for a ten-minute cooldown. Racing tips, including the now-familiar ""carbo-overload"" theory that some runners swear will provide surplus energy in races, a chapter on women, one on children's running (it's good for them, too), pointers on clothing, injury advice, and, as a final fillip: the story of a 72-year-old man who says running has made him the Casanova of his retirement community. Adequate information, but not a patch on Fixx' bestselling effort.