This is the breathing muscle trainer that uses resistance to strengthen muscles used to optimize airflow. A five-minute routine consisting of only 30 breaths, twice a day, helps build stamina, boost vitality, and reduce blood pressure. Eleven adjustable levels help you improve over time via an easy-to-read resistance level indicator. The ergonomic design and comfortable mouthpiece encourage you to stick with the routine and achieve measurable results. Light or medium resistance.