The Lung Exerciser is a highly efficient device that is used as a method of respiratory therapy aimed at improving lung activity, developing the muscles responsible for breathing and performing exercises on deep breathing. This device is commonly used in hospitals, rehabilitation facilities, physiotherapeutic institutions, and even in one’s own household for the purpose of recovery after surgical operations, respiratory diseases, or long periods of inactivity. Due to its simplicity of operation and three-ball construction, this device helps the user increase his inhalation capacity through visual perception. Usage of such devices promotes a higher oxygen intake and good lungs functioning. Produced from reliable materials, this lung exerciser is light-weight and hygienic enough to be used by anyone.