Breathing Training: The breathing resistance exerciser works the diaphragm muscles by increasing the resistance during inhalation and exhalation, increasing athletic endurance and fitness. It also helps you relax. Durable Silicone, Detachable: Made of soft and durable pure silicone, lung trainer is more comfortable to use. The detachable design is easy to clean thoroughly and prolong the service life. Compact and Portable: Breathing fitness trainer has a compact design that makes it easy to use anytime and anywhere - at home, in the office, at the gym, or even while traveling. Breathing exercises are not limited by time and place. lung trainer breath adjustable resistance exercise device improve breathing techniques endurance training fitness enthusiasts portable muscle silicone high quality exerciser non slip pattern easy clean versatile use athletes senior exercises Versatile: Our exercise equipment is a must-have for sports enthusiasts who engage in high-energy activities such as sports, running, gymnastics, martial arts and outdoor activities. Exercise trainer instrument is also suitable for singers and older people who wish to perform breathing exercises.