Powerlung

Power Lung Sport Resistance/Respiratory Breathing trainer Power Lung is biohackers optimal breathing tool. The Sport model uses maximum resistance training specifically designed for elite athletes and those in superior physical condition. For those engaged in strenuous, competitive training activities the Sport offers the highest levels of resistance. This model is not suited for the casual user, performing artist, or those whose activity is moderate to high. Select the Sport if you have the physical conditioning of a Navy SEAL® or professional athlete. >