http://articles.mercola.com/sites/articles/archive/2003/05/03/walking.aspxWhile government recommendations say that 30 minutes of moderate daily activity, such as brisk walking, will ward of heart disease, a study found that only vigorous exercise lowers the risk of early death from heart disease. The study involved 1,975 menenCommunityServer 2008.5 SP1 (Build: 31106.3070)