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That exercise is good for us is uncontested. But, what about extreme exercise such as running marathons? Some marathoners have suffered heart attacks and few of them couldn’t survive the attack. Even the first Greek marathoner collapsed after his run. But, is extreme exercise such as running a marathon really that dangerous for the human heart? Before that, we also need to define extreme exercise. Don’t press the panic button as yet. There is lot of good that happens too. Cardiologists, who are or were marathon runners, discuss the pros and cons of extreme exercise. Part of the verdict is that training helps. But, the devil is in the details and for that you must check out this well-researched write-up: