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Vital Signs Breaking the 2-hour marathon A_00040020
Vital Signs Breaking the 2-hour marathon A_00040020

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    Breaking the 2-hour marathon

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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.

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.