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elliptical machines benefits provide a great lower body workout; machines that have moveable arms also work the upper body at the same time. The best thing about elliptical machines is that while you can get a terrific cardio workout, the exercise is low (or no) impact because you keep your feet in place on the pedals. There is no jarring of the knees or hips as one experiences on a treadmill, so the elliptical machine is a great option for seniors or those recovering from an injury that want to stay active.