http://articles.mercola.com/sites/articles/archive/2006/12/21/too-much-exercise-is-just-as-bad-as-not-enough.aspxAfter a number of years in which almost no deaths were caused by heart attacks during marathons, at least six runners have died in 2006. Some physicians, including Dr. Arthur Siegel, author of numerous studies of Boston Marathon racers, believe that theenCommunityServer 2008.5 SP1 (Build: 31106.3070)