The Bas Ruten 02 Trainer has many perks to using this system. It will strengthen your ventilator muscles, cause an increase in oxygen transporting red blood cells, and it will increase your overall endurance. Its super easy to use, you start with the largest attachment that allows the most air in and out and you wear it while doing a cardio exercise. As your cardio endurance grows, place a smaller attachment that makes your lungs work harder to breathe in and out. In just a few short weeks you will see a dramatic difference in your endurance! Any runner, triathlete, boxer, or fitness guru in your life will love this as a gift.