Researchers at King's College in London examined the genetic markers of biological aging of 2,400 twins. During this research, they found that a comparison of the subjects who exercised the most (an average of 199 minutes weekly) to those who worked out the least (a mere 16 minutes or less a week) suggested that those that exercised were on average as much as a decade biologically younger than the slackers.
The following link is The Scientific American reports on the study. http://www.sciam.com/article.cfm?id=new-study-links-exercise-to-longevity
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