On the right side of your Embody Chair is a round joystick that can be used to adjust your seat height. To raise your seat height, angle the joystick upward and lift your weight off the seat until it raises to your preferred height. To lower your seat, angle the joystick downward while sitting and lower the seat to a comfortable height. At the proper seat height, there should be slightly less than a 90 degree angle between your thighs and calves.
You can see instructions on all adjustments for the Embody Chair here:
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