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How much exercise is too much?

from The Boston Globe

Growing evidence shows that overdoing endurance training may damage your heart and shorten life expectancy. But don't hang up your running shoes and wetsuits just yet. Dr. Paul Thompson has run 29 Boston Marathons over the past four decades — he finished 16th in 1976 — but has also spent a good part of his career as a cardiologist researching the detrimental effects that high-endurance training has on the heart. more

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