Ive been working out on the Nautilus and Eagle low back machines for months at my health club. How could my back possibly be weak?
The Nautilus and Eagle “low back machines” are really pelvic extensor machines. The muscles that push up the weight stack are actually the hamstring and the gluteus muscles. If you watch people from the side while they are working out on those machines, the spine really does not move much at all. Almost all of the motion is the pelvis rocking back and forth on the hip joints. Therefore, the lumbar muscles get very little, if any, workout. A controlled study done at the University of Florida (Reference 2) showed that people who worked out on either the Eagle or the Nautilus “low back machine” for 12 weeks actually gained no strength at all in their lumbar extensor muscles, although their hamstring and gluteus muscles did improve significantly.
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