It is pretty much the same as any other type of professional program. To be a professor...you gotta get a PhD. At least all of our professors were. You can go several routes with the PhD. Pretty anything that interests you such as higher education, neuroscience, exercise phys., biomechanics, physiology, etc.
You can be an instructor at a PT program with a straight PT degree, usually at least a Master's or DPT these days. Usually....but possibly not at all schools, a DPT won't allow you to be a "professor". If you are going the instructor route, it usually helps to know someone, or have some sort of contact with the school. Best way is to try and start out as a clinical instructor or lab assistant etc. and then work your way in.
I am not sure this helps at all.