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A proper kneeling chair creates the open body angle by lowering the angle of the lower body, keeping the spine in alignment and the sitter properly positioned to task. The benefit of this position is that if one leans inward, the body angle remains 90 degrees or wider. A misconception regarding kneeling chairs is that the body's weight bears on the knees. In a proper kneeling chair, some of the weight bears on the shins, not the knees, but the primary function of the shin rests (knee rests) are to keep one from falling forward out of the chair.
Kneeling chairs were designed upon the ergonomic concept "A strong back is a healthy back." By promoting good posture, the chairs strengthen the lower back muscles helping spinal alignment and support. A kneeling chair also encourages you to find your natural balance line, which runs in a line from your ear, to shoulder, to hips and ankle when you are seated.