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![Sparthos High Altitude Mask – Simulate High Altitudes – for Gym, Cardio, Fitness, Running, Endurance and HIIT Training [16 Breathing Levels]](https://i3.wp.com/m.media-amazon.com/images/I/61tD-qgqObL._AC_SL1100_.jpg?w=300&resize=300,300&ssl=1 "Sparthos High Altitude Mask – Simulate High Altitudes – for Gym, Cardio, Fitness, Running, Endurance and HIIT Training [16 Breathing Levels]")