YOU’RE a parent and you want to do your best to be sure your children are healthy. So you worry about physical activity. How much exercise is enough? Will being active protect them againstdiabetes, cancer or heart disease later in life? Will it prevent them from getting fat? You search for information, for official guidelines on physical activity. And, you soon discover, there is plenty of advice — at least 27 sets of official guidelines, notes Harold W. Kohl, an epidemiologist at the University of Texas School of Public Health in Austin who formerly worked at the Centers for Disease Control and Prevention.

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