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The secrets of the SitBones chair All SitBones Ergonomic Office Chairs have a reduced seat depth compared to traditional chairs. This means that slouching is impossible; the sitter has to have the base of their spine at the rear of the seat, the lower lumbar curve is supported and the spine is held in perfect alignment. The Groove model has a front to back groove in the seat. This takes advantage of the position of the body on the chair to eliminate pressure on the coxyx, the prostate gland and the male and female genitals.