Boost Your Stamina: Improve your breathing and upgrade your workout routine with our respiratory o2 trainer. Use our pulmonary exerciser daily and witness your performance get better day by day. Upgrade Your Lung Capacity And Tone Your Abs: With our ab strengthener, you may increase your core muscles and oxygen intake and your breath-holding in no time. Forget the exhausting cardio exercises burning off needed calories. Enjoy Adjustable Resistance: Now you can adjust the pressure levels on the Nemstar deep breathing lung exerciser. Find the level of resistance that suits your training and adjust it accordingly. Enhance Your Overall Performance: Our breathing exerciser can help improve your overall performance by strengthening respiratory muscles and abs. Easily and quickly increase your breath endurance. Help Improve Lung Capacity: The breath exercise help improve lung capacity and works to counteract against build-up that may be caused by toxins, tar, environmental pollutants, allergens, dust and cigarette smoke.