contortionist hanbook exercises + pilates is a good start for most but not all people
conortionist handbook shows how to start at a beginner level and work your way up to a contortionist level gradually and safely
There are various editions online and it is free
Problem with statistics is they do not work on an individual level
So you need to try different things and see what personally decreases your pain in the long run
A exercise routine might hurt for the first week
But doing the same exercise routine should decrease in pain on the second week
If pain continues to increase on the second week ( and you are doing it for the same duration, frequency and intensity ) then it is a bad exercise routine for you personally
A chiropractor or physical therapist should give you exercises to perform at home
@that_groyper
Once you found a exercise routine that decreases in pain from the first week to the second week when duration, intensity and frequency is the same then you can gradually increase duration by 10% per week aa long as the intensity of the pain remains the same or decreases but if the intensity of the pain increases then you should do a different exercise
Once you can not increase duration due to time limits you can increase intensity and lower the duration and start over again