Ben Greenfield Demonstrates a Fitness Mouthpiece
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Added: 2 years ago
From: bengreenfieldfitness
Views: 2,356
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    LesleyAnneStormo 2 days ago

  • I swam in it lastnight. It took a good 10 minutes to figure out how to "block out" the water that naturally came into my mouth, but after that, didn't really notice the mouthpiece...didn't do any pace tests, just played around with it.

    bengreenfieldfitness 2 years ago

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