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Many back problems, such as slipped disc, sciatica, lumbar pain, neck pain, rounded shoulders, & frozen shoulder, are the result of, or result in, weaknesses in the deep muscles of the back and abdominals. The bar can be used while standing, balancing, kneeling, sitting, lying, or moving, making it the ultimate piece of core training equipment in the gym, with a personal training client, for injury rehabilitation, or for use at home. The action of shaking the bar is the key to the FLEXI-Bar's effectiveness.