Breathing exercise device, adjustable resistance, improve lung capacity, portable hand-held expansion training tool

Features Enhance strength: The breathing trainer can enhance breathing strength and control performance, improve anaerobic threshold, and push your limits. Improve endurance: Using the breathing trainer can improve the strength of respiratory muscles and endurance, which may increase the permissible exercise limit. Easy to use: Breathe slowly through your mouth, as deeply as possible. Hold your breath for a few seconds. Exhale slowly through the mouth until completely exhaled. Daily use: Breathing and lung exercises can effectively improve lung function and prevent respiratory diseases. Do 10-15 times to complete the set. Do 2 to 4 sets per day. Wide application: The small-sized deep lung breathing exercise device is easy to carry, and can be used by adults, seniors, children, swimmers, athletes, singers, etc. Specifications Item type: Breathing exercise Materials: Silicone Application: Wide range of applications, can be used by adults, seniors, children, swimmers, athletes, singers, etc. How to use The mouthpiece: Insert the mouthpiece into the mouth and bite inside the mouth to hold it in place. Adjust the inhale and exhale resistance valves by selecting the breathing resistance you want (make it difficult but not uncomfortable). Turn the valve to the left for more resistance (+) and to the right for less (-). Package list 1 × Breathing exercise device 1 × User manual