All-in-one respiratory muscle strengthening device [IMT/PEP] This is a medical device for respiratory muscle exercise and respiratory rehabilitation for respiratory disease patients and the elderly. Breathing training strengthens the respiratory muscles before and after surgery and prevents complications such as pneumonia after surgery. It is a device for respiratory muscle rehabilitation exercise that can perform both inspiratory muscle exercise and expiratory muscle exercise simultaneously. Target users are those who need breathing exercises such as those with a lung disease, who lack lung capacity, who need cardiopulmonary endurance, and who want to prevent pulmonary complications after surgery.