I would definitely take Exercise Physiology, Abnormal Psychology, and Medical Terminology. They aren't prerequisites at all schools, but I definitely ran across a few that required them. I also think they would be beneficial to an aspiring PT.
Pathophysiology, Pharmacology.
Even though I would never want to be a Psychologist, I found many of my Psyc classes to be very interesting. I think many of the things I learned will be helpful and carry over to PT. I took Psyc of Learning, Sensation and Perception, Intro to Neuroscience, Physiological Psyc, Research Methods, and a few others.
In general, if you want to be a PT, try to take classes that interest you and might also help you become a better PT.