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Fewer than half of adults in the U.S. engage in recommended levels of physical activity. A 2007 survey shows that on any given day, only 18.5% of Americans engage in exercise. At the same time, daily caloric intake for the average American has increased by more than 500 calories since 1970. In the absence of increased physical activity, 500 extra calories per day for one year translates into 52 additional pounds of body weight! With the majority of adults moving less and eating more than in years past, it is easy to see why rates of obesity and overweight have steadily risen.