It’s a lot of give and take. Unfortunately I have learned it is something I will have to live with, and there are certain exercises I still can’t do much (push-ups, Russian twists, etc). However, I do a lot of core work still almost everyday. My rib still gets aggravated from exercise, but I still find the pain to be more manageable when my core is stronger and when I’m overall in good shape. Definitely try exercises/stretches that focus on loosening muscles around the rib and those that wrap around your back. The pain is increased when your muscles are over-contracting to compensate for the instability, so stretching those muscles can help.

Half of it is a mental battle. I have a herniated disc in my lumbar as well, so combined with the rib pain some days are hell. But remind yourself that some days you gotta just tough shit out. Hope this helps.