Sansa had him bent over with her strapon for a few too many hours.
On a more serious note, my backs been ****ed for a month. No health insurance but I saw a doc and she said cold compress until numb followed by a hot compress, and try to do some light stretching.
The ones on the right seem to help me the most. Also, try to stay active. I know my back hurts the most on my days off when I turn into a sloth.