The Triflo II Inspiratory Exerciser is a training device to strengthen breathing muscles, for individuals who have lung conditions; also, for patients who have undergone abdominal or chest surgery. The Spirometer has three color coded balls, one in each of the three cylindrical chambers, which rise in the chamber when a person inhales through the attached mouthpiece. The balls provide a visual indication of how breathing muscles are working to incentivize progress through slow sustained maximal inspiration.