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Color:Black☛What is a breathing resistance training mask? ✍The air intake amount is determined by different intake valves, and the different intake air amounts correspond to the air thinness at different altitudes. Through this way you can achieve simulated altitude training or enhance the function of the respiratory muscles. ☛Benefits:✍By limiting the volume of air entering the mask to limit the volume of oxygen, you can increase the intensity of training and enhance personal strength by wearing the mask. ✍Better improve your muscle strength, help to burn fat, and increase basal metabolic rate. ✍Mainly trained in muscle endurance in an anaerobic state. Increase explosive power. ✍Enhance cardiopulmonary function and endurance. ☛size: Head circumference of 44-48cm choose S size;Head circumference of 49-51cm choose M size;Head circumference of 52-56cm choose L size.