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<http://schema.org/description>
"This unique breathing device enables individuals to practice breath control by building the diaphragm muscles using isometric exercises. The container is constructed of durable transparent plastic which holds a lightweight ball. While blowing vigorously into the mouthpiece, the aim is to hold the ball at the top of the device as long as possible. This develops strength in the diaphragm muscles. Build your breath and build your health!"
<https://store.weinermusic.com/collections/3259-performance-enhancing-aids/products/breath-builder>