"Runners run barefoot around some debris from Coldstream Park in Lexington, <a class=""taxInlineTagLink"" id=""PLGEO100102400000000"" title=""Kentucky"" href=""/topic/us/kentucky-PLGEO100102400000000.topic"">Kentucky</a>.<br> <br> Compared with sedentary subjects, those who ran regularly were 70 percent less likely to experience high stress and life dissatisfaction, according to a study of more than 12,000 people published in the Scandinavian Journal of Medicine & Science in Sports. Regular exercise increases adrenal activity, which facilitates stress adaptation and enhances the release of <a class=""taxInlineTagLink"" id=""HHA000030"" title=""Hormones and Metabolism"" href=""/topic/health/human-body/hormones-metabolism-HHA000030.topic"">hormones</a> like noradrenaline, serotonin, beta-endorphin, and dopamine. These hormones all improve mood, says Peter Schnohr, M.D., the study's lead author."
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