Product and Specifications:BOOST YOUR STAMINA: Take your wkouts to the next level with our breathing resistance trainer. By incpating our pulmonary exerciser into your daily routine, you can improve your breathing witness a gradual increase in your stamina perfmance over time.UPGRADE YOUR LUNG CAPACITY and TONE YOUR ABS: Our o2 lung trainer not only helps you tone your ce muscles but also enhances your oxygen intake breath-holding abilities. Say goodbye to exhausting cardio exercises embrace a targeted approach that improves both your lung capacity abdominal strength.ENHANCE YOUR OVERALL PERFMANCE: Strengthen your respiraty muscles abs with our breathing lung exerciser device, ultimately enhancing your overall perfmance. By improving your breath endurance, you'll notice a positive impact on your athletic abilities daily activities.HOW TO USE F EXHALATION: You always breathe through your mouth, meaning through the restriction. Exhalation uses diaphragm and abs exertion to push air out. Find resistance level where exhale finishes at the same time as you get impulse to inhale. Repeat several times, rest, repeat again, rest, repeat again. Repeat 3-4 times or week. Enjoy the bonus of toning abs muscles while breathing better Specifications:Product Name: Breathing TrainerSize: about 510cm or 1.973.94inchMaterial: Silicone, ABSWeight: about 68gUse: Aerobic exercisePacking List:1 Lung Capacity Exerciser DeviceNotes:1. Due to the lighting effects photographing angles, there is a col difference in the product, please underst.2. Due to manual measurement, there is a tolerance in the product size.