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"There's little science to support the theory that working out before lights out will stop you from sleeping. In fact, a study by Shawn Youngstedt, Ph.D., an exercise-science professor at the University of South Carolina at Columbia, found that active people who did a moderately intense session up to 30 minutes before bedtime had no snooze disruptions. Why? The physically fit tend to sleep better, regardless of when they sweat. So rest easy about those P.M. routines."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.self.com/story/q-and-a-working-out-at-night>