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The O2 Trainer restricts air intake to strengthen abdominal muscles and regulate your breathing form training your body to increase air intake with every breath.
The O2 Trainer was based on a simple, yet powerful concept. By controlling air intake, you immediately begin breathing the right way - using your diaphragm. The smaller the air intake hole, the harder your lungs need to work to pull air in, strengthening and condition the diaphragm muscles.