Physical Therapist Assistants (PTAs) use a variety of hands-on treatments and modalities, under the direction of a physical therapist , to improve function, relieve pain, improve mobility and increase ability of their patients. PTAs work in a variety of settings including hospitals, out-patient clinics, school systems, rehabilitation centers, nursing homes, sub-acute facilities, assisted living centers, home health care organizations, fitness centers, private practices, sports medicine centers, cardiac rehabilitation centers, aquatics programs, pediatric centers, equine therapy programs and many other specialized areas. However, responsibilities vary depending on the work setting. PTAs working in the school system assist with seating, gait training and improving motion, mobility and posture. A PTA in a hospital may see stroke victims, burn patients and a shoulder injury all in one morning. PTAs working in an out-patient orthopedic and sports medicine setting help patients with acute injuries. Each setting is different, and PTAs may move from one setting to another as their career progresses.