You're no doubt well aware of how a good workout can melt away the day's stress. But what happens to that post-workout feeling of calmness if new stresses arrive? According to a study published in Medicine & Science in Sports & Exercise, you'll still have lower levels of anxiety than if you had encountered the new stress after being sedentary.
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http://news.runnersworld.com/2012/09/18/exercise-lowers-anxiety-even-after-stressful-event/