I have had occasion to use physical therapy (PT) and occupational therapy (OT), and a relative has used speech therapy.
I personally found PT to be helpful. The PT person should have background in appropriate exercises and exercise levels for rehabilitation, somewhat like a specialized personal exercise trainer. I am confident it is better than spending the same amount of time doing unfocused exercises.
OT focuses on more specific actions to function in ordinary life, and speech therapy focuses on speech and memory. These may not have as general a value as PT, but you could be surprised by what they might be good for. Speech therapy was prescribed for a relative to retrain swallowing to avoid getting fluids in the lungs.