With the Respirometer the user pushes air through a mouthpiece connected to a unit with three chambers, each containing a color-coded ball with the minimum flow imprinted on the outside of each chamber. As the user takes deep breaths to push air into the exerciser, it lifts the color-coded balls with an airflow rate of 600 to 1200 cc per second. When all three balls reach the top it means that the user has reached 1200 cc. The colored balls provides a visual indication of how their breathing muscles are working to incentivize progress through slow sustained maximal inspiration.

Its compact design makes it easy to hold and is preferably done when user is at rest either lying down or sitting up. The durable break-resistant plastic holds up well and is latex-free.