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Training Mask's colored resistance valves allow you to increase resistance as you build your stamina and strength. Snap-on snap-off valves allow you to adjust the resistance on the go while making a fashion statement. Make fatigue and training plateaus a thing of the past. Strengthen your diaphragm by adjusting Training Mask 2.0's resistance valves to change resistance levels. 9x too intense? Start off at 3x and work your way up!