Lung Exerciser is an equipment used in respiratory therapy, whose primary aim is to make sure that deep breathing is done in order for the lungs to work properly. The equipment works on the basis of the three-ball concept, where one trains his/her breathing muscles in order to increase lung capacity. The equipment ensures there is enough air movement within the lungs. Lung Exerciser is portable and easy to use, hence can be utilized both in hospitals and at home.