Longer, faster, harder = Chronic Cardio Exercise. Is it good for you? Does training and running a marathon improve your fitness at the expense of your heart? There's a lot of conflicting opinions but I trust this source: he's a former runner, and he lives his business everyday:
http://www.marksdailyapple.com/the-evidence-continues-to-mount-against-chronic-cardio/#more-37262
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