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View all search resultsUS scientists who studied the performance of myriad athletes -- including adventurous souls who spent five long months running across the United States -- have come up with an estimate of the absolute physiological boundary of human endurance.
Offering a variety of trainers and workout styles so you can find out what works for you, these YouTube's free workout channels also give you the flexibility to exercise when and where is best for you, and all for free.
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