Physical Modalities. Topics: Heat, Cold, Ultrasound, Diathermy, Electrical Stimulation, Iontophoresis, Traction, and Biofeedback. Part of the Medical Rehabilitation series of the Reflex PM&R Board Review podcast. The full companion chapter and a linked board-style Q-bank set for this topic are at https://www.reflexpmr.com/read/MEDREH-06.