It is favorable, if the backrest of both is trained along more ver running musculature seits the managing, the S-form of the spinal column adapted bearing surfaces trough-shaped as on nahme the spinal column on both sides. These hollows förmigen recesses of the backrest, which takes up the musculature running on both sides the spinal column,made possible with it a nearly pressdruckfreie work of this musculature during sitting.
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