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.

Proudly made in The USA!. Immediate benefits - It will open the airways into your lungs that have been partially obstructed over the years, due to natural aging, pollution, poor physical condition, and smoking (if applicable). Long term benefits - Will target and develop the respiratory muscles ( the diaphragm and intercostals) to help you inhale more volume of air/oxygen into your lungs and to exhale more carbon dioxide out. Highly Durable - Heavy duty plastic construction and 100% rust proof. Very Compact, only 4" tall - You can take it anywhere and use it anywhere (Pocket Sized). Extremely Comfortable. The flexible medical grade silicone mouthpiece is extremely comfortable, providing excellent fit and seal. Once in your mouth, you don't even need to hand hold it. Highly Effective - Offers the widest range of inspiratory/expiratory resistance levels to meet anyone's needs. From low resistance for respiratory rehab patients, gradually increg to a high resistance level for competitive athletes. Improves endurance, breath holding and shortness of breath. Easy To Use - Only one moving part. Turn the valve to the left to decrease the air flow in order to create more resistance and turn it to the right for the less.

Date First Available: February 16, 2018. Best Sellers Rank: #27,161 in Health & Household. Customer Reviews: 4.4 out of 5 stars 129 ratings 4.4 out of 5 stars. : B079VRL27T. Size: ?2 Count. Part Number: ?689354348312. Manufacturer: ?Expand-A-Lung. Number of Items: ?1. Brand Name: ?Expand-A-Lung. Package Weight: ?0.12 Kilograms. Item Package Dimensions L x W x H: ?7.28 x 4.49 x 1.54 inches.