I mentioned I am doing kettlebell weight training post-PT, but should have added I needed to do many things to get my 60-year-old back under control.

1. (still keep doing the PT-prescribed stretch/exercise regimen every day)
2. 2x per day massage with percussion massager units. These are awesome, I use two together, one for each side.
3. Posture improvement - keep checking form, use standing desk, etc.
4. Weight training using kettlebells.

I am 2 years post-PT and it has been a continual slow improvement over the two years.

For the bike I switched to an endurance frame with 30mm tires and make sure to take a stand-up pedal every 10 minutes or so to stretch the back out.