A physical therapist assistant (PTA) helps a physical therapist implement a treatment or rehabilitation program. An outpatient PTA provides physical therapy support services in a private practice setting, outpatient clinic, or another facility. You assist patients who come to the facility specifically for treatment but who only stay for the length of their appointment. Your duties as a PTA include helping patients perform exercises, use equipment, stretch, or perform other movements as prescribed by the physical therapist. Your responsibilities often involve setting up equipment for each patient, cleaning the physical therapy area between appointments, and documenting patient progress.