is so tiny you wouldn't believe it. they get so easily clogged. we're busy eating high cholesterol diets and not exercising enough. david and i talk about the mediterranean diet which is terrific for the heart. exercising regularly. >> you barely could keep up with him on that bike. >> are you kidding? i couldn't keep up with him. there's the message. people that cardiac risk factors. people completely fit can still get the blockages. one-third of all heart attacks appear in patients who have no symptoms whatsoever. james fix who actually wrote the complete book of running and started the jogging craze died in 1984 while jogging of a heart attack. >> this is one thing i want to learn. i read all the data. this is a question that i have. if that's the case, should everybody get stress tests and forget about all of the -- >> okay. that is a great question. should everybody get a stress test? the answer is no. you get a stress test if you have cardiac risk factors or if