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Should Nike's Vaperfly Be Banned From Competition?

It's the trainer that help Eliud Kipchoge break the 2 hour marathon mark last year, but since then, Nike's Vaperfly trainer has shaved minutes off a number of records around the world. Now, some people are calling for them to be banned from competitions. We spoke to ultra marathon runner and Kinesiology Ph.D. from the Michigan Performance Research Lab to explain why there is so much controversy over the runner.

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