Used to get it...before I had my hip replaced. My hip was so shot that it had caused changes in my gait and really played hell with the musculature all the way to my thoracic spine. I walked with a limp. A year later, totally recovered and getting a lot of power and flexibility back.
I'd have never thought that almost all of the back pain was coming from my bad hip(s)!
The other one is getting replaced in 6 months.