1. Improve your endurance with a breathing trainer: By using a breathing trainer, you can enhance the strength and endurance of your respiratory muscles. Respiratory muscle fatigue is a limiting factor during exercise. By strengthening the respiratory muscles, you can increase your exercise limit, thereby improving your endurance in daily life and overall health. 2. High - quality materials: Made of high - quality silicone materials, it is non - toxic, odorless, harmless and environmentally friendly. You can use it with confidence. It improves breathing and durability during shortness of breath and provides adjustable resistance during inhalation and exhalation. It is lightweight and compact, so you can carry it with you. Almost everyone can use it without any side effects. 3. Easy to use: It adapts to all mouth shapes, provides a perfect seal and is comfortable to use. Inhale slowly and as deeply as possible through your mouth, hold your breath for a few seconds. Then exhale slowly through your mouth until you can hardly breathe. Repeat the above exercises 10 - 15 times to complete the set. Practice 2 to 4 sets per day. 4. Enhance physical function: The lung endurance trainer helps reduce deposits caused by body excretions and significantly improves lung capacity. To improve overall performance, the lung breathing trainer helps strengthen your respiratory and abdominal muscles. 5. Multifunctional application: The lung breathing trainer helps strengthen your respiratory and abdominal muscles, thereby improving overall performance. It offers different resistance levels, and the breathing trainer has adjustable resistance, which you can easily adjust. It is suitable for various occasions such as swimming, diving, surfing, running, fitness, and traveling.