What BS degree do you need in physical therapy?

You don't need a BS degree *in* physical therapy to become a physical therapist. You need a Doctor of Physical Therapy (DPT) degree, which is a professional doctorate, not a bachelor's degree. While you'll need a bachelor's degree *before* you can enter a DPT program, the bachelor's degree can be in any number of subjects, although programs often prefer applicants with backgrounds in science.