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28 West Gym - I've witnessed guys using oxygen deprivation masks for an hour while doing heavy squats. So, you'll have no problem wearing a simple face mask while doing circuit training.
Do Altitude Training Masks Work for Endurance Athletes? - CTS
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That Training Mask Doesn't Do What You Think It Does
The Truth About Hypoxic Training and Oxygen Reducing Masks - Breaking Muscle
Tip: Ditch the Oxygen Deprivation Mask
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How to exercise with a face mask - CNET
Fact check: Experts say face masks don't cause oxygen deprivation
