A new study shows that longer, fast-paced running sessions are just as bad for you as not running at all. How much exercise is genuinely good for you? And why do we always think more is better? 

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Today's story was sent in by pariah1165:  http://www.latimes.com/science/sciencenow/la-sci-sn-running-health-20150202-story.html and  http://time.com/3692668/when-exercise-does-more-harm-than-good/

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