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The human heart at rest pumps around 5-7,000 liters of blood, during normal exercise up to once as much and during heavy exercise up to 5 times as much during 24 hours. It is downloaded up to 100,000 times a day. Each of us can influence its function to some extent. But why do we voluntarily destroy our hearts? Questions for Prof. MD Josef Kautzner, head of the IKEM Cardiocentre.