Posture

My back has been hurting for over a week.  I went to the chiropractor and had some relief, but still have a feeling of strain.  So I've spent a lot of time trying to straighten out my heating pad so I could lean against it. Today I discovered that if I stand up straighter, almost cartoon-soldier straight, it didn't hurt. That's a new attention to posture for me...I've always thought I had good posture.