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Engineered to increase inspiratory (inhalation) muscle endurance, the O2 Trainer is lightweight and designed to be used while performing nearly any exercise or activity. Whether you're running, weight lifting, or rock climbing, the O2 Trainer will train your lungs and body to perform at high levels with less oxygen, and teach them to maximize every breath.
DESIGNED FOR EVERYONE AT ANY PERFORMANCE LEVEL!

 

The Reason the O2Trainer Doesn't Have Resistance When Exhaling