My back has developed into major pain city. The whole pelvis feels like it is biting me. I was taking pain pills: Ibuprofen, Tylenol. I even went to a back doctor, who looked like he was readying his itchy scalpel fingers. He did agree to send me to PT, but said that surgery usually gets better results than physical therapy.
I have a set of 4.5" inflatable balls that I use for some exercises. I put one under my pelvis, while lying on my back. I didn't feel like getting up and doing anything, so I lay there, on the ball, for about an hour. When I got up, I felt sore, but the biting pain was gone. The next morning, I was no longer sore, and the pain was gone.
The pain started to come back in the evening -- the sides of my pelvis, just above where my legs attach hurt so much I didn't think I could walk my dog. I lay on the ball again for 15 minutes and the pain disappeared.
I do not usually endorse commercial products. I am not in contact with anybody who makes or promotes this product. Nobody is paying me for an endorsement. Probably other balls of similar size will work. If you have something similar around the house, by all means try that. This works for me. I had two friends over who also have low back aches. It worked for one of them, but not the other.
The Miracle Ball Method: Relieve Your Pain, Reshape Your Body, Reduce Your Stress [2 Miracle Balls Included]