FILE - This Nov. 1, 1977 file photo shows marathoner Jim Fixx near his Connecticut home where he runs just for the fun of it. In July 1984, the acclaimed author and running guru died of a massive heart attack while trotting along a country road in Vermont. Boston Marathon race director Dave McGillivray is cautioning people thinking of running a marathon to talk with their doctors before hitting the road, especially if they have coronary artery disease or a family history of it. (AP Photo/Jerry Mosey, File)