Running too far, too fast, and too long speeds progress 'to finish line of life'

Vigorous exercise is good for health, but only if it's limited to a maximum daily dose of between 30 and 50 minutes, say researchers.

Source: http://feeds.sciencedaily.com/~r/sciencedaily/health_medicine/fitness/~3/6QDFb6ED-P8/121129143456.htm

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