There are lots of different settings you can work in as a physical therapist. Outpatient, sports, acute care/hospital, skilled nursing facilities, women's health, just to name a few. You have the option to open your own clinic or business, or work as part of an existing company, hospital, or facility. An opportunity for growth for inpatient therapists is to become Director of Rehab, or you can go the corporate route and oversee several buildings. If you start feeling stagnant in one setting, there are lots of different options. PTAs can become Directors of Rehab and clinic owners, however this can get tricky with PTAs needing to be supervised by PTs. I believe the exact rules vary by state.