A Polish research group wrote a review article about sudden cardiac death among competitive athletes, that can happen during both training and afterwards. It is most common in athletes younger than 35 and it is usually associated with inappropriate physical activity due to a lack of specialized medical examination. As confirmed by the Framingham Heart Study, conducted in the 1980s on an American population, natural causes represented 13% while cardiac causes accounted for 88%. The most important problem with regard to sudden death is the undiagnosed heart problems. Particularly interesting is the shortage of medical tests performed on amateur athletes, which can have tragic consequences.