Vital Signs Breaking the 2-hour marathon A_00040020.jpg
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Breaking the 2-hour marathon
It's called the holy grail of running, a feat once thought impossible: to run a marathon under two hours. But athletic shoe companies, including Nike, think it can be done.
7:56 • Source: CNN
Pushing your body to its limit 4 videos
Vital Signs Breaking the 2-hour marathon A_00040020.jpg
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Breaking the 2-hour marathon
7:56
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• Source: CNN
Vital Signs Pushing our bodies to the limit B_00001123.jpg
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Pushing our bodies to the limit
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Vital Signs Take the plunge in Scotland C_00011116.jpg
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Take the plunge in Scotland
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Run the right way: like prehistoric man
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• Source: CNN