About this item 【Pushes Your Limits】: our training mask enhances your fitness and workout tolerance by improving your breathing power, flexibility, and stamina. 【8 Resistance Levels】: Eight levels of simulation, manual quick adjustment, training intensity upgrades, a wider range of simulated altitudes, free and fast switching gears 【Benefits】: Wearing this sports mask and doing moderate amount exercise, the increased growth hormone will help you burn more fat, build more muscle, and recover faster after an intense workout. 【Ideal for All Fitness Levels】 - Whether you’re a pro athlete or a beginner, you can take full advantage of our training mask. With it’s 8-level graded resistance, our training breathing mask helps bring out the formidable fitness warrior in you. 【Make Your Training More Effective】: Ideal for Sports Conditioning, Core Stability, HIIT Cardio Sessions, Cardio Stamina Training, Plyometrics, Recovery Training, Aerobics, Home Workouts, Agility&Speed Workout, Strength Training.