A ball chair is not an exercise ball chair. Looking at the illustration on Wikipedia, it's clear that a ball chair forces a C-shaped spine. Your spine will stay in an S-shape if you sit upright on the "chair" I'm referring to.
Seeing as that design is never mentioned in respects to ergonomics and certainly wouldn't "bounce" anything, I strongly suspect the quoted passage was referring to the inflated balls you sit on.
daveungerer|16 years ago
A ball chair is not an exercise ball chair. Looking at the illustration on Wikipedia, it's clear that a ball chair forces a C-shaped spine. Your spine will stay in an S-shape if you sit upright on the "chair" I'm referring to.
Avshalom|16 years ago