Does Training Mask remove oxygen from the air I breathe?

Training Mask DOES NOT alter the composition of the air you breathe. If it did, it would cost 1000s of dollars, weigh about 200Kgs, plug into the wall and make a humming sound. Training Mask makes your lungs work harder (breathing resistance), similar to the effect of 'thin' air at higher altitudes, and it does this anywhere you want to train (except underwater...) for a fraction of the cost of a full hypoxic system.

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