Maximize your performance in both training and professional fights with more lung capacity than you’d ever dream. The Bas Rutten O2 Lung Trainer actually exercises your lungs during any workout, training them to perform better, increasing breathing power and endurance. The idea is that if your lungs demand less oxygen when you’re working hard, you’ll be able to work harder and longer. The material for this groundbreaking system is fully biodegradable silicon, which is safe for the environment. It includes 8 screens to use during workouts, and 4 screens for breathing exercises, as well as a carrying case and alcohol wipes. Take your training, and your body, to the next level with this revolutionary tool for any athlete.