Vital Signs Pushing our bodies to the limit B_00001123.jpg
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Pushing our bodies to the limit
Endurance training isn't just for elite athletes anymore. Want to change up your workout? Some former military personnel have some ideas
07:29 - Source: CNN
Pushing your body to its limit 4 videos
Vital Signs Pushing our bodies to the limit B_00001123.jpg
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Pushing our bodies to the limit
07:29
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- Source: CNN
Vital Signs Breaking the 2-hour marathon A_00040020.jpg
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Breaking the 2-hour marathon
07:56
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Take the plunge in Scotland
07:49
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Run the right way: like prehistoric man
03:19
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- Source: CNN