What about an oldy but goody.
"No pain no gain"
"Use it or lose it"
You can't spell party without PT
PT is Rehabulous
Probably not what your after. I do like some of the answers you have had
My physical therapists was an honors graduate from the University of Pain.
University of Pain Alumni
A spin off of Little Nemo's Dorie fish would be Just Keep moving, moving, moving! .... Put one foot in front of the other. .......Reach for the stars. Hope someone posts one that will seem to fit with who you are making the shirt for. Pam