A new study from the American Cancer Society followed more than 73,000 women for 17 years.and found postmenopausal women whose only exercise is walking an hour a day still reduce their chances of getting breast cancer 14 percent. Women who engage in more vigorous exercise lower their risk even more - 25 percent. Current guidelines recommend adults do at least two and a half hours of moderate exercise, or 75 minutes of vigorous activity per week. But, studies show less than half of U.S. women do even that much. Researchers say it doesn't have to be a marathon. A leisurely walk every day can still make a big difference.
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