On February 6, 2011, an article in the Reference News said, “The World Health Organization (WHO) advocates 150 minutes of exercise per week, and a healthy lifestyle can reduce the risk of cancer by one-third”. According to the article, “Martin Weissman, medical advisor to the World Cancer Research Fund, points out that maintaining a healthy weight, a sensible diet and appropriate physical activity can prevent people from dying unnecessarily from cancer”; “Low exercise is the main cause of 21 to 25 percent of breast and lung cancers worldwide. “; The World Health Organization recommends that adults should engage in at least 150 minutes of exercise of appropriate intensity each week. Examples include walking for 30 minutes a day, five days a week, or commuting to work by bicycle every day. Lack of exercise is the fourth highest risk factor for death globally.