This "Back Buddy,"a simple, plastic, knobby "S," has served me well for many years. My friend John, a yoga instructor and trigger point massage therapist, advised me to get one years ago when my back was in excruciating pain and I couldn't stand up straight. He showed me how to use it to smooth out knotty clenched up muscles, and ever since I have used it to relieve pain in my lower back, shoulders, neck, and even the bottoms of my feet.
It's not the total solution. A jacuzzi or a weekly massage would be nice -- but this tool is effective, inexpensive and immediate.