The idea of a “chair champion” is not as foolish as it seems. In my direct experience:
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People don’t know how to adjust their chairs, or simply don’t adjust them.
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People at the edges of the bell curve are rarely given a chair their size. The image that may spring to mind is a petite female, but actually a too-large chair works better for them than a too-small chair works for a large male. (You can at least lower the too-large chair. The issues then become arm and lumbar placement.)
Bill Stumpf, the codesigner of the Æron, almost angrily insisted when I interviewed him a decade and a half ago that I use only the Size C chair because one is never supposed to be conscious of the boundaries of the chair. I’ve made a point of checking ever since, and in only one case in the last 15 years have I ever seen any reasonably large male in a Size C. (I have a C.)
If, when you lean back in your chair, you know where its frame is, the chair is too small.
I don’t think hiring a consultant to fit everyone properly in a chair in which they sit for eight hours a day is a waste of money. A chair, as I.D. called the Æron, is a machine for sitting.