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Sparthos Training Mask - Simulate High Altitudes - for Gym, Cardio, Fitness, Running, Endurance and HIIT Training [16 Breathing Levels] Military Camo sold2024 Sandproof Beach Mat 79" XSparthos Training Mask Simulate High Altitudes for Gym, Cardio, Fitness, Running, Endurance and HIIT Training [16 Breathing Levels] Push Past Your Physical Limits With SPARTHOS Have you ever noticed how calm and relaxed the best endurance athletes look when theyre pacing themselves through a race? The ease with which they run 5: 00 min mile or cycle above 30 mph? Obviously they put in a ton of training time, which you probably cant replicate, but they