But according to Shirley Sahrmann, a professor

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But according to Shirley Sahrmann, a professor in the physical therapy program at the Faculty of Medicine at the University of Washington (Faculty of Medicine, University of Washington) in St. Louis, this movement and variations contradict the natural biomechanics of the lumbar spine. Sahrmann says in his book "The diagnosis and treatment of movement Nitro XL decline syndromes" (diagnosis and treatment of syndromes immobilizer) that "the backbone of the rotation down the back is more serious than the benefit, and the rotation of the pelvis and lower limbs to the side while the trunk of a stable or break away is particularly dangerous."

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