Certain face masks claim to improve endurance performance by restricting how much air you can breathe in. But are they legit? Here’s what the experts and research say.
Altitude Masks for Running: What are the Benefits? - The WOD Life
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TRAININGMASK - Elevation Training Mask 2.0 - Fitness Mask, High Altitude Mask, Workout Mask, Running Mask, Breathing Mask, Endurance Mask (Small, Black) : Altitude Training Mask : Sports & Outdoors
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Elevation Training Mask Do High Altitude Training Masks Work?
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