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Altitude Mask

An Altitude Resistance Mask that was created to cater to those who are seeking physical and pulmonary resistance training in a high altitude environment. The mask promotes this training environment by creating pulmonary resistance and increasing your overall performance. Used by thousands of athletes around the globe, Altitude Resistance Mask reduces your training time by two-thirds and enhances your workout efficiency to develop the best version of yourself.

https://altitude-mask.com