The best health outcomes are actually found far below the exercise levels of even casual endurance athletes. A 15-year observational study of 52,000 adults found that the highest degree of survival and health was found from running less than 20 miles per week, in runs of 30 to 45 minutes over three or four days, at about an 8:30 to 10:00 pace. The benefits decrease at amounts greater than that.
Read more at http://running.competitor.com/2012/06/news/how-much-running-is-bad-for-your-heart_54331#6WoA5FeryQoI2rwt.99
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