By all standards of success, James Templeton seemed to have it all. He was a highly successful businessman, had a beautiful wife and daughter, and, only in his early thirties, had his whole life in front of him. To avoid the same fate as his father and grandfather, who both died of heart attacks at a young age, James became an avid runner--a passion that he believed helped him stay fit and healthy. Imagine his shock when, during a routine physical,...