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Is it possible to run too much?

Name: Is it possible to run too much?
Uploaded: 2015-03-13T18:33:05-0400
Duration: 3 min 55 s
Description: CBSNews.com health editor Parvati Shallow explains recent studies showing that running too much can have health risks and that runners also live three years longer than non-runners.

CBSNews.com health editor Parvati Shallow explains recent studies showing that running too much can have health risks and that runners also live three years longer than non-runners.