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The various core exercises you can do make exercise balls good for strengthening your back. Here's a maneuver that itself can make an exercise ball worthwhile. This is especially good for people who spend a lot of time sitting, especially hunched over (like over a computer). When your back starts to tighten up, lie down with your back on the exercise ball and your knees bent, feet on the floor. Let your arms go out to the sides and completely relax, stretching out your back. Then you can roll around a little and give yourself a massage!