B07H2ZC7ZD Sport Fitness Workout Exercise Air Resistance High Altitude Elevation Oxygen Deprivation Hypoxic Endurance Running Breathing Cardio Training Mask

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Color:black,standard size with stick elastic head band strap fits all
Simple Usage and easy to put on,Ultra Lightweight,Anatomically Designed,Non-Slip Training Strap
This training mask can indirectly make it easier for you to adjust to higher altitudes by forcing you to get used to breathing more and breathing properly.
Such a good tool to strengthen and expand your lung capacity under oxygen deprivation. it forces you to control your breathing which will help any athlete improve breathing technique
Perfect gift breathing trainer tool for men woman athlete in all physical training exercises to enhance their overall performance