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Keiser A-250 Lower Back Machine 2821The Keiser Air 250 Lower Back Machine 2821 is both an essential and complimentary companion to the Keiser Air 250 Abdominal Exercise Machine 2721. It works to strengthen the critical erector spinae muscles of the back, the site of most back problems. Keiser engineers have created a machine with easy access; keeping adjustment to a minimum. The seat belt comfortably secures the pelvis in the correct position.