1. Functional and Effective: The lung training device strengthens your lung capacity and helps you adjust the abdominal muscles, allowing you to train the core muscles. 2. CHANGEABLE RESISTANCE: The Deep Breathing Lung Exerciser is designed with adjustable resistors, enabling you to easily find the right resistance level and adjust accordingly. 3. Strengthen Body Performance: To help you achieve better overall performance, the breathing trainer for lungs aids in building your breathing and abdominal muscles. 4. Development of Lung Capacity: The Lung Endurance Trainer improves your lung capacity, helping reduce accumulation caused by body excretion. 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-Minnanxin