Bas Rutten O2 Inspiratory Muscle Training Device for Improving Diaphragmatic Breathing | Portable Lung Muscle and Respiratory Power Training Device | High Altitude Breathing Trainer | GreenBrand: Bas Rutten Color: Green Features: Bas Rutten Respiratory Training Device: Designed by Bas Rutten himself, the O2 Trainer is a lightweight and portable breathing exercise device for lungs that helps increase inspiratory (inhalation) muscle endurance. The breath trainer regulates air intake while also improving oxygen efficiency during exercise. Fast and Noticeable Results: With just 30 reps (under four minutes) of the O2 lung trainer, you will