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The Vikingstrength Workout Mask is a revolutionary training tool that simulates high altitude training, allowing you to push your limits and improve
Vikingstrength New 24 Levels Workout Mask for Running Biking MMA Endurance with Adjustable Resistance, High Altitude Elevation Mask for Air Resistance
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Does anyone know what these oxygen-less masks are? Adrian Ballinger and Ueli both have the same one it looks like. Googling “high altitude masks” doesn't help. : r/alpinism