This is the MAXIMUS Fitness Accelerator: a breathing trainer that helps you strengthen your lungs and improve your athletic performance. It has 5 customizable resistance levels from 25 to 75%. It has dual airflow resistance technology to let you adjust airflow resistance in both directions.
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MAXIMUS is pretty easy to use: simply choose the airflow resistance level that matches your fitness level, put the mouthpiece in your mouth, and do your favorite workouts. The longer you use it, the stronger your respiratory muscles get.
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