I havent tried this exercise, but one member of a group I follow on Facebook (Ehlers Danlos Athletes) was prescribed it and found it wonderful. It has some ideas which I havent met before (and I hope are correct), so I just pass it on in case anyone finds it useful. I think it could do with exploring, and will work on it sometime.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2971640/
You can also download a pdf file of the paper from the site (it was too large for me to attach here).
Jim.