Feature 1Improve 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. 2Increase Respiratory Strength: Enhance respiratory strength and control performance. Training your anaerobic broadening and push your limits. Increase oxygen intake and maintain endurance. 3Easy 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. 4Lung Capacity : It helps to expand and improve your lung capacity without the danger of doing a lot of cardio and burning calories. 5Portable Device: The lung breathing trainer is very small and portable. With this device, you can perform your training routine wherever you are. 6Wide 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.SpecificationItem Type:BreathingExerciseDeviceMaterial: Silicone, ABSColor: Black and white .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 xBreathing Exercise DeviceNote1. Do this exercise in a well ventilated area2. Smokers should not do this exercise3. Single person use