1. Improve endurance with a breathing trainer: Using a breathing trainer can enhance the strength and endurance of the respiratory muscles. Respiratory muscle fatigue is a limiting factor during exercise. Improving the respiratory muscles can increase training limits, thereby enhancing endurance and overall well - being in daily life. 2. High - quality materials: It is made of high - quality silicone material, odorless and safe. You can use it with confidence. It can improve breathing in cases of shortness of breath and has a long service life. It provides 100% adjustable resistance during both inhalation and exhalation. It is lightweight and compact, making it easy to carry around. Almost anyone can use it without side effects. 3. Easy to use: It adapts to all mouth shapes, has excellent sealing performance, and is comfortable to use. Inhale slowly and as deeply as possible through the mouth, hold your breath for a few seconds. Exhale slowly through the mouth until you can hardly breathe out. Repeat the above exercises 10 - 15 times to complete one set of exercises. Perform 2 to 4 sets per day. 4. Improve physical function: The lung endurance trainer helps reduce the accumulation of waste in the body and significantly increase lung capacity. To achieve better overall performance, the lung breathing trainer helps improve the respiratory and abdominal muscles. 5. Wide range of uses: The lung breathing trainer helps improve the respiratory and abdominal muscles, thereby enhancing overall performance. It offers different resistance levels, and the resistance of the lung breathing trainer is adjustable, which you can easily modify. It is suitable for various occasions, such as swimming, diving, surfing, running, fitness, traveling, etc.