I strongly recommend that ever guy over 35 get a nuclear scan of their heart....
http://wiki.medpedia.com/Nuclear_Heart_Scan
Most people dont realize that plaque can build up on the outside of a coronary artery which will have no symptoms until a fatal heart attack. The artery will actually be crushed from the outside in as compared to typical coronary artery disease that will cause a build up within the artery.
A lawyer I know was dead before he hit the floor will running on a treadmill. He was 40 and in great shape and was a runner.