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Face masks don't hinder breathing during exercise, study finds ...

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The New York Times
SOURCE: https://www.sciencedaily.com/releases/2020/11/201105112934.htm
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Summary

2 days ago ... "This is important when fitness centers open up during COVID-19 since
respiratory droplets may be propelled further with heavy breathing duringĀ ...

As said here by https://www.sciencedaily.com/releases/2020/11/201105112934.htm