The #1 Choice of Competitive Athletes Worldwide Excellent Breathing Exercise for Cycling Endurance Training The #1 Ranked Respiratory Fitness Trainer by The L.A. Times   INCREASE YOUR LUNG CAPACITY AND ENDURANCE Breathing Resistance Exercise →Stronger Lungs → Better Breathing For Superior Performance (100% Drug Free) The "EXPAND-A-LUNG" inspiratory / expiratory breathing resistance exerciser is a breakthrough product for respiratory fitness training.-- Research supports that this type of exercise significantly improves the strength of respiratory muscles, and increases the volume of lung ventilation. The end result is deeper, easier and better breathing for superior performance. (For research information visit www.expand-a-lung.com) It is a fact that breathing resistance exercise will develop stronger lungs, and this in turn can provide an endurance advantage for any sport. It can also be beneficial to people who suffer from shortness of breath, due to natural aging and respiratory disorders. About our Exercise Our breathing exercise is modeled after the relaxing and slow breathing exercises used in Yoga and Tai Chi.  Our exercise promotes relaxation and proper breathing technique, but with the addition of adjustable resistance to meet anyone’s needs. It is a slow and continuous flowing breathing resistance exercise, inhaling and exhaling through the comfortable mouthpiece. About Our Product Only one moving part, 100% rust proof & practically indestructible, The Expand-A-Lung is very easy and comfortable to use. It's also pocket size (4" tall), so that you can take it anywhere. It comes with a 5 yr. warranty for parts & labor. Most Effective & Easy To Use The Expand-A-Lung offers the widest range of resistance levels to meet anyone's needs. From a low resistance for respiratory rehab patients, gradually increasing to a high resistance level for competitive athletes. No other product can achieve this range with a single model. To exercise, simply select the breathing resistance level with the adjustable valve, and then slowly inhale, hold and exhale through the comfortable silicone mouthpiece. (Simple exercise instructions are included with the product) Try it and you'll be impressed with the results. If you're not satisfied, we will refund the full purchase price, if returned within 30 days.