Feature:1. Improve Endurance: Using a breathing trainer can improve the strength and endurance of the respiratory muscles, fatigue of the respiratory muscles is a limiting factor in exercise, strengthening the respiratory muscles can improve the limits of exercise.2. Increase Respiratory Strength: Enhance respiratory strength and control performance. Training your anaerobic broadening and push your limits. Increase oxygen intake and maintain endurance.3. Easy to Perform: Inhale slowly and as deeply as possible through your mouth and hold your breath for a few seconds. Exhale slowly through your mouth until you are almost completely out of breath. Then repeat the above exercise 10 to 15 times to complete the set. Do 2 to 4 sets per day.4. Lung Capacity : It helps to expand and improve your lung capacity without the danger of doing a lot of cardio and burning calories.5. Portable Device: The lung breathing trainer is very small and portable. With this device, you can perform your training routine wherever you are.6. Wide Range of Applications: It is suitable for overhead training, swimming assistance training, running training, etc. Can be used for adults, the elderly, children, swimmers, athletes, singers, etc.Specification:Item Type: Breathing Exercise DeviceMaterial: Silicone, ABSColor: Black and white.Package List:1 x Breathing Exercise DeviceNote:1. Do this exercise in a well ventilated area2. Smokers should not do this exercise3. Single person use