✅ CUT YOUR WORKOUT TIME IN HALF! - Training Mask by SPARTHOS makes workouts more effective by simulating high altitude. It will force you to take full and deeper breaths, toughening your diaphragm and respiratory system. | ✅ UNLOCK THE CHAMPION IN YOU – Breathe efficiently and reach unmatched endurance. Less fatigue, hardened body, more energy after training. | ✅ PROVEN RESULTS, PROVEN TECHNOLOGY