Unfortunately, I don't believe that the increase in your PSA is directly associated with your workouts and I agree with @trusam1 that even if it was, I would recommend to continue the workouts.

I'm only a patient, but can share my experience that I resumed workouts after my RP and also eventually had rising PSA values similar to yours. My blood tests for PSA also included measuring testerone levels, amongst several other tests. I shifted to 6 week tests after the PSA levels started to increase, because I wanted to understand the doubling time characteristics. I didn't do a PSMA scan, because I knew at levels below 0.2ng/ml, the likelihood of anything showing up were very small. After getting educated on options and discussing with my doctors, I decided to initiate salvage radiation when my PSA got to 0.15ng/ml in early February of this year. My thinking was to hope the residual cancer cells were localized in the prostate bed and I wanted to treat them before they could spread further. I chose salvage radiation at a center of excellence and I know that my regular workouts served me well through the 35 treatment routine and my first post-treatment PSA test results were better than I had hoped.

I do recommend having the discussion with your doctors on next step options. Although many doctors will advise to wait until the PSA rises to 0.2ng/ml (BCR - biochemical recurrence) given your Gleason history and seminal vesicle invasion, you may also want to consider earlier treatment options or at least be prepared if the PSA value continues to rise. Your PSA value is still very low and if any residual cancer cells are localized, post-RP treatments can still be curable. There is a lot of information available (PCF.org, PCRI.org, etc.) about post-RP BCR treatment options to help prepare you when you decide to discuss with your doctors.

Best wishes for whatever you decide.