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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.
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The dangers of oxygen deprivation on Everest | CNN
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The Knuckleballs of Kilimanjaro: R.A. Dickey Plots His Ascent - WSJ
Do Altitude Training Masks Work for Endurance Athletes? - CTS
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Can oxygen deprivation make you a better athlete?
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Can oxygen deprivation make you a better athlete?
Training Mask Benefits: About, Use, Safety, and More
Breathing is Good for You (Stop wearing Hypoxic Masks!) by John Vilardi - Athletic Lab
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Elevation Training Masks And Whether They Really Work
Oxygen deprivation could help improve mobility for patients with spinal injuries: study | CTV News
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