Product Description & Specifications: BOOST YOUR ENDURANCE: Take your workouts to the next level with our breathing resistance trainer. By incorporating our lung trainer into your daily routine, you can improve your breathing and witness a gradual increase in your endurance and performance over time. UPGRADE YOUR LUNG CAPACITY & SHAPE YOUR ABS: Our o2 lung trainer not only helps you sculpt your core muscles but also enhances your oxygen intake and breath-holding ability. Say goodbye to strenuous cardio exercises and embrace a targeted approach that improves both your lung capacity and abdominal strength. IMPROVE YOUR OVERALL PERFORMANCE: Strengthen your respiratory muscles and abdominal muscles with our breathing and lung training device, ultimately enhancing your overall performance. By improving your respiratory endurance, you'll notice a positive impact on your athletic abilities and daily activities. HOW TO USE FOR EXHALATION: You always breathe through your mouth, meaning through the restriction. Exhalation uses the diaphragm and abdominal muscles to push air out. Find the resistance level where exhalation finishes while you get the impulse to inhale. Repeat several times, rest, repeat again, rest, repeat again. Repeat 3-4 times/week. Enjoy the bonus of shaping your abs while breathing better! Specifications: Product Name: Breathing Trainer Size: about 5*10cm/1.97*3.94inch Material: Silicone, ABS Weight: about 68g Usage: Aerobic exercise Packing List: 1 * Lung Capacity Trainer Notes: 1. Due to the lighting effects and shooting angles, there is a color difference in the product, please understand. 2. Due to manual measurement, there is a tolerance in the product size.