because every time that happens i just lowered the exercise level, got my breath back, and it was never painful. it was just tight. >> if this isn't good for my heart, i don't know what is. >> by the time he felt the first symptoms, that tightness in his chest, president clinton's heart disease was well advanced. it had been decades in the making. >> you don't die with your first plaque. you develop atherosclerosis blockages really your whole life for many, many years before it causes a heart attack or stroke. >> and what the doctor told me next should ring a bell of hope for just about anyone who's ever worried about a heart attack. doesn't have to happen. >> one of the best kept secrets in the country in medicine is that doctors who are practicing aggressive prevention are really seeing heart attacks and strokes disappear from their practices. it's doable. >> you're saying with what we know right now, we don't have to have any more heart attacks in this country.