Final answer:
A physical therapist (PT) is a highly trained expert who helps people with muscle or joint injuries improve their physical functioning and reduce impairments through assessment, program design, and monitoring of muscle function improvements.
Step-by-step explanation:
A physical therapist (PT) is a highly trained expert in the mechanics of body movements and specializes in helping people with muscle or joint injuries improve their physical functioning and reduce functional impairments. They assess the capabilities of a patient, design a program to enhance these capabilities, and monitor the progress of muscle function improvements. In addition to providing hands-on treatment, PTs also instruct patients on home exercises and the proper use of equipment.