The Official Bas Rutten O2Trainer
Don't let the simplicity fool you, this device works wonders! Engineered to increase inspiratory (inhalation) muscle endurance, the portable O2 Trainer can be used while doing nearly any exercise. Whether you're running, weight lifting, or rock climbing, the O2 Trainer will train your lungs and body to perform at a high level, using less oxygen and increase your lung volume. For working out: change the restriction of airflow by using the 10 numbered caps provided. Start with "end cap number 1 " which has a hole of 13mm, and as your endurance increases, you decrease the size of the insert and go to "end cap number 2", it's that easy! There are four additional end caps that can be used to train your lungs at rest. Whether you're standing, sitting, or lying down, you can still exercise your lungs and diaphragm, with the Bas Rutten O2 Trainer. NOTE: If you have problems with a mouthpiece in your mouth, this product is not for you