【Strengthen your lungs】This is a stamina-building lung trainer that utilizes restrictive breathing techniques to enhance your lung capacity.You can do 10 15 times to complete a set, do 2 to 4 sets a day, just breathe in slowly through your mouth, as deep as you can, hold your breath for a few seconds, slowly exhale through your mouth until completely exhaled, can effectively improve lung function 【Portable and Durable】Our deep breathing lung exerciser is small in size for easy to carry and of high quality, which is portable and resuable 【Easy to use】it can easily adjust the resistance by a simple twist. it can be disassembled by gently pulling apart, making it easy to clean. Good lung exerciser for home use 【EffectiveTargeted】 breathing exercises support lungs and enhance a comprehensive breathing plan, is helpful to improve your breath,helps you get better endurance,and makes you feel better day by day. 【PERFECT Fitness Gift】 This well-built deep breathing device is great for improving exercise tolerance and enhancing your performance day by day. Perfect choice for adults, seniors, children, swimmers ,athletes, singers, smokers, etc.