So let's get back to the question. Did they work? It depends what the goal was. If the goal was to flatten the lumbar spine, the answer is yes. If the goal was to stretch the spine and the lower kinematic chain, the answer is yes. If the goal was to prevent the development of future back problems, the answer is probably not. Nothing that we know of has been shown to prevent future episodes, so that shouldn't be any major surprise.
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