A breathing device meant to improve the respiratory system of a user includes a mouthpiece, a front piece, an inhale ring, a middle piece, an insert slider, and an exhale ring. The insert slider is slidable between an inhale position and an exhale position. Various grooves, bumps, slots, ribs mate with, engage, slide, and rotate with respect to one another to allow a user to adjust the amount of airflow through the breathing device. The breathing device disclosed herein is easy to assemble, to use, and to adjust to varying levels of resistance.
