The flow of air in and out of the alveoli is called ventilation and has two stages: inspiration (or inhalation) and expiration (or exhalation). To accomplish this, the whole thorax moves and changes size, due to the action of two sets of muscles: the intercostal muscles and the diaphragm. These are the muscles that are strengthened by using the Expand-A-Lung Breathing Resistance Exerciser. In essence, you inhale more oxygen, and you exhale more carbon dioxide. The result is a substantial improvement in shortness of breath and endurance through better breathing. All is done naturally, with the help of the Expand-A-Lung Breathing Resistance Exerciser. 5 year unlimited warranty for parts and labor.USED BY NAVY SEALS!!! "THE BEST 7 MINUTE EXERCISE TO BOOST ENDURANCE" - The #1 Choice of the L.A. Times' Review for Athletes & Respiratory Care Patients (COPD) -"Superior Quality and Best Value" - "Most Compact (4") and Portable" - "Easiest to Use" - "Most Effective" - "Improves Endurance, Breath Holding & Shortness of Breath!" - "Provides 100% Adjustable Resistance for Inhaling & Exhaling". Featured in the Following Magazines: "RUNNER'S WORLD, TRIATHLETE, AUSTRALIAN TRIATHLON & MULTISPORTS, VELONEWS CYCLING, FREE SURF HAWAII, HAWAII SKIN DIVER, INTERNATIONAL FREEDIVING, THE BOX (CROSSFIT), BLACK BELT MARTIAL ARTS, INTERNATIONAL KICKBOXER.100% Adjustable Resistance Valve for both, Inhaling and Exhaling Breathing Exercise. "This is The Only Product that Provides All Levels of Inspiratory and Expiratory Resistance in One Single Model".Use Indoors or Outdoors (100% Rust Proof). Most Durable and Easiest to Use. - Medical Grade Flexible Silicone Mouthpiece Makes a Perfect Seal. Fits All Size Mouths Comfortably! THE IDEAL HEALTH GIFT" - FREE SHIPPING + FREE MANUFACTURER'S 5 YEAR FULL WARRANTY.
