Chest Physical Therapy
Chest physical therapy (CPT or Chest PT) is an airway clearance technique (ACT) to drain the lungs, and may include percussion (clapping), vibration, deep breathing, and huffing or coughing. These instructions from the Cystic Fibrosis Foundation describe how to perform chest physical therapy.
Chest PT instructions

https://on.cff.org/3GSKh0z