if it is genetics like family history than all this exercise and other things will not prevent the heart attack in any form. what you need to do is stop becoming panic, as an educated person be brave and consult a general physician and explain yoursef and the family history of heart attack, get the heart test done once in every year or so with the same physician, also have links with the cardiologist so that this will come in handy at the time of emergency. plan your health if you cannot avoid it.