Just inhale through ISOBREATHE for a few minutes twice a day in a simple breathing pattern as shown in the instructions. Ultra-breathe works on the principle of resistance. As you inhale, the resistance created makes your respiratory muscles work harder, and the harder they work the stronger and more durable they become. As your breathing power improves, ISOBREATHE can be gradually adjusted to provide more resistance with just the twist of a knob. Whether you're exercising for cardio fitness or sports, you'll breathe deeper and more easily than ever. Within a month you will be on your way to feeling the wonderful effects of strong, healthy lungs! Helps improve lung capacity to improve fitness and endurance. Ideal for helping users gain better lung stamina for better workouts. Resistance easily adjusts for varying lung fitness levels Provides a daily workout for your lungs from the comfort of your chair. Simply inhale through the ISOBREATHE for a few minutes a day for better lung stamina. ISOBREATHEUltra-breathe works on the principle of resistance. As you inhale, the resistance created makes your respiratory muscles work harder, and the harder they work the stronger and more durable they become.