The big one, and the sturdiest thing in the kneeling range: a heavy wooden frame on a deep rocker, with a padded backrest on a wooden stem so there is something to lean into when you want a break — most kneeling chairs give you nothing. Four knobs do the adjusting, two for seat height and two for the knee pad, so the fit is dialled in rather than fixed.
The open hip angle is what does the work: roughly 110 degrees instead of the 90 a normal chair holds you at, which lets the pelvis tilt forward and the spine settle into its own curve. Natural wood with linen-look upholstery. Pick this one for size and solidity; pick the Ergonomic Kneeling Chair with Backrest if you need the seat to go higher.
