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  • New book: Too much exercise can hurt the body's most important muscle
    Photo courtesy of VeloPress

    New book: Too much exercise can hurt the body's most important muscle

    Given that we’ve been told for years that exercise is good for you, it seems counterintuitive to think it can actually mess with the proper functioning of your heart. But studies are showing that long hours of training over decades can indeed change the physical makeup of the heart muscle, throwing off the complicated electrical system that keeps it working properly.

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