Regular physical activity brings benefits, both cardiovascular and for the rest of the body, however, sport can carry risks in patients suffering from heart diseases. Some conditions, such as atrial fibrillation, are more common in athletes, but it has never been shown that there is a limit beyond which sport becomes harmful. It appears, however, that intensive sports activity does not provide more cardiovascular benefit than moderate activity. It should also be kept in mind that sport does not immunize against risk factors and cardiovascular diseases. It is therefore important not to trivialize a patient's symptoms under the pretext that he or she has a level of fitness above average.