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Taking on the CrossFit Games: Sneak Peek

"Nightline" goes inside one of the hardest fitness competitions on Earth, where athletes test extreme limits.
01:09 | 08/01/2014

Transcript for Taking on the CrossFit Games: Sneak Peek

pushing themselves to the limit. But are they pushing too far? This may just be the most extreme fitness competition on Earth. A triumph of mind over muscle. Another man who is in the top five in the... See More
This transcript has been automatically generated and may not be 100% accurate.
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