subject: About Ergonomic Kneeling Chair With Back [print this page] Ergonomic kneeling chairs with back still have the seat that is tilted so that the person's hips are tilted forward, thus aligning the spine into the natural S curve, rather than compressing it. In addition, by tucking the knees under the person in a modified kneeling position, the ergonomic kneeling chair with a back allows some of the weight to be distributed to the knees and shins rather than entirely on the buttocks.