Sparthos Training Mask Simulate High Altitudes for Gym, Cardio, Fitness, Running, Endurance and HIIT Training [16 Breathing Levels] Military Camo sold2026 [HOLLOW AND BREATHABLE DESIGN] This A Graphics and More [HOLLOW AND BREATHABLE DESIGN] This bike saddle cover is crafted with a deep groove with hollow mesh anti aging and electrical insulation merits Read more How Sparthos affects your body Oxygen Restriction Lungs work harder and oxygenate more blood More calories burned by working out at higher intensities CO2 Tolerance Hit exhaustion later with more stamina Boost your tolerance for high intensity activities Mental Focus Growth Thrive outside your comfort zone Improve mental focus and toughness Breathing Muscle Boost Strengthen the diaphragm and other breathing muscles Retrain your body to breathe correctly Read more 16 Breathing Levels That Continue To Challenge Your Body While most training masks look the same they also help your body utilize oxygen more efficiently