"Because important health benefits are linked to strength training, a national health objective for 2010 is to increase to 30% the proportion of adults who perform physical activities that enhance and maintain muscular strength and endurance on greater than or equal to 2 days per week. CDC analyzed 1998-2004 data from the National Health Interview Survey to determine the annual prevalence of strength training among U.S. adults by age group and race/ethnicity. This report describes the results of that analysis."

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