Respiratory therapy is generally recommended to patients who are suffering from certain conditions that affect their lung functions such as cystic fibrosis or emphysema, and even more severe conditions that require surgery such as cancers. This type of therapy consists of different techniques that have as their main purpose the patient's recovery of their breathing functions. Some of the most common respiratory therapy techniques are the use of special equipment and devices like PEP mask, Couch Assist, or Acapella, chest clearing techniques, exercises, postural drainage, etc.