Marathons Can be Bad for the Heart-But Only Temporarily – TIME Healthland.
I guess it makes sense that extreme overexertion can damage the body. A marathon is certainly an admirable challenge to push the body to its limits, but it shouldn’t be mis-categorized as a “healthy” activity. According to the article less experienced/in-shape runners suffered more heart damage. You have to be healthy to run a marathon, not the other way around.
