I've had this pain/strain in one side of my lower back off and on for the past couple years. I strained it this morning moving some furniture and it's very annoying. The pain is located about 2-3" to the left of the spinal column right about where the pointy top part of your hip bone is. It hurts when I twist my trunk or when I sit down, lean forward and then try to straighten up. What is this injury and what preventative exercises should I do?