A kneeling chair works by tipping the pelvis forward and dropping some of your weight onto the shins, which opens the hip angle and stops the lower spine from rounding the way it does in a conventional seat. Used regularly it efficiently corrects posture and strengthens the core, because the trunk has to hold itself upright rather than leaning on a backrest. Getting the geometry right for your own leg length is the whole game, and this one adjusts from 21 inches to 26.5 inches: at the lowest setting the frame occupies 28.5 inches by 18 inches, and as the seat rises the footprint shortens to 24.5 inches by 18 inches. Both contact points are thickly padded with high-density sponge, a 17-inch by 12-inch seat cushion and a 17-inch by 9-inch knee cushion, each 4 inches deep so the shins are not resting on a thin pad over metal. Waterproof faux leather covers the padding, wiping clean in a moment and promoting daily maintenance rather than making it a chore. Underneath, a stable triangle structure with a reinforced metal bracket keeps the frame from twisting as your weight shifts forward, and it carries a rated 220 lbs on a chair that weighs just 19 lbs in total. The four universal wheels are smooth and every one of them locks, so you can roll the chair into position and then brake it solid before leaning onto it. Assembly is needed, the manual is included, the chair stores away easily when not in use, and it meets various needs as a reading chair, kneeling chair, or meditation chair.