Discovery Channel :: News, Photo Zoom :: Too Much Exercise Can Damage Heart
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Photo Zoom

Too Much of a Good Thing?
AP Photo/Laurent Rebours

Too Much of a Good Thing?
Tour de France winner Lance Armstrong, of Austin, Texas, rear at center, pedals with the pack as riders chase a two-men breakaway during the 7th stage of the Tour de France cycling race on July 10, 2004. A new study of high endurance athletes finds that, in some cases, so much training may cause damage to the heart.

Pictures: AP Photo/Laurent Rebours

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