Improves endurance: Using a breathing trainer can improve respiratory muscle strength and endurance. Respiratory muscle fatigue is a limiting factor in exercise. Strengthening the respiratory muscles can improve respiratory limits. Helps increase lung capacity: Breathing exercises help increase lung capacity and help counteract buildup that can be caused by tar, environmental pollutants, dust and cigarette smoke. Adjustable resistance: you can adjust the pressure level of the pulmonary respiratory system. Depending on your lung capacity, adjust the flow valve and practice breathing activities. Find the resistance level that works for your workout and adjust it. Daily use: Breathing and O2 can effectively improve lung function and prevent respiratory diseases. Do 10 to 15 times in a single group. Do 2 to 4 sets per day. Improve your overall performance: Pulmonary trainers are essential for all types of people in sports. Sports that require greater energy performance, such as track running, swimming, gymnastics, martial arts and other outdoor activities, require higher physical activity and greater breathing capacity. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store