There are stretching and strengthening regimens out there but really, whatever you have been doing is probably fine ... if you want to add more cardiovascular I suggest starting with something gentle like walking or cycling or using machines at the gym like the elliptical trainer.
Since the pain and stiffness of spondylitis are caused by systemic inflammation there's no standard PT regimen that is helpful. PT can help identify areas that are weak but in my experience they usually don't tell me anything I didn't already know
And strengthening those areas has never helped reduce my spondy pain, unfortunately. I know some others have had different experiences so PT is something that likely won't hurt & might help if the time and expense are not excessive.
Jen, 42, happy partner of James and Moma to Evan, 14, & Lucy, 12.5 (Crohn's dx @ age 3; on Remicade since April 2010.) I take piroxicam, Flexeril, & Nucynta ER nightly. 3 anti-TNFs didn't pan out for me.
"Science is the father of knowledge, but opinion breeds ignorance." -- Hippocrates