[An amateur marathon runner after sudden cardiac arrest. Whether and when can he return to sport competition?].

Regular physical activity of low/moderate intensity is associated with numerous health-related benefits and, the most importantly, longer life. However, every second patient fails to achieve the suggested weekly dose of 2.5 hours of moderate physical activity. On the other hand, there is an increasing number of people who regularly overdose - marathons or triathlons competitors. While there are no clear data against amateurs' participation in long distance runs, more and more reports on the possible dangers of overdosing extreme endurance exercises appear. A case of an amateur runner has been presented, competitor in 50 marathons, who underwent a sudden cardiac arrest while preparing for the next marathon run. Based on the current guidelines, we discuss the issue, whether and when a patient in whom an ICD was implanted, can return to sport competition.