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Here are some simple little tricks I picked up a few years ago that have ended up being a life saver for neck/shoulder, low back, & foot pain.
Take 1-2 tennis balls and put them in a tube sock, tying off the sock close to the balls but not so tight they won't move. Then sit or stand with your back against a hard surface. Hold the empty end of the sock in your hand and drop the ball end between your shoulder & the wall, adjusting until you feel the "right" spot,