http://articles.mercola.com/sites/articles/archive/2002/10/19/exercise-breast-cancer-part-two.aspxEven moderate physical activity -- for example brisk walking for at least 2 miles three times a week -- over the course of a lifetime can reduce a young woman's risk of developing breast cancer by 33%, and the risk of breast cancer after menopause byenCommunityServer 2008.5 SP1 (Build: 31106.3070)