This past week had some serious back problems. Thought I might even be having another kidney stone. Have since determined that to not be the problem. Back hurt from hip (actually even felt like side of hip) all the way up to my shoulder- mostly felt to be on my left side. Any ideas or link to good exercises for the back? Also, should you do back exercises while it's hurting or afterwards & use as preventive measure? I am taking a 2 week break from exercise to heal it up- is this wise or should I exercise it?