Abstract: An ergonomic chair includes a support body having a seat support portion and a back support portion. A forward sloping seat track is positioned on the seat support portion. A first seat portion engages the seat track on the seat support portion for forward and rearward movement along the seat track between a forward position and a rearward position. A second seat portion is provided having an upwardly extending back rest. The second seat portion is pivotally connected to the first seat portion. Movement of the first seat portion forward along the seat track toward the forward position draws the second seat portion forward with forward movement of the second seat portion causing movement of the back rest downwardly. This allows for subtle movement forward and backward movement that energizes major leg muscles.

Abstract: A backrest for use with a chair that has a seat and a base. The backrest includes a lower member having a proximal end and a distal end, and upper member attached to the chair at the proximal end. A spring-hinge mechanism pivotally connects the lower member in the vicinity of the distal end to the upper member. A lumbar support is attached to the upper member and the lower member and spans the spring-hinge mechanism. In use a user sitting on the seat may, by anterior flexing of the user's upper back cause the upper member to pivot relative to the lower member from an unflexed position to a flexed position.

Abstract: A chair that has movable thigh levers to permit a shifting of body weight when seated and thereby relieve spinal discomfort and pressure points experienced when seated for long periods. A lever support rocker is provided to coordinate movement of the thigh levers. Downward pressure exerted by a user's thigh to lower a first thigh activated lever causes a rocking movement of the lever support rocker which results in an upwardly movement of a second thigh activated lever.

Abstract: A chair that has movable thigh levers to permit a shifting of body weight when seated and thereby relieve spinal discomfort and pressure points experienced when seated for long periods. A lever support rocker is provided to coordinate movement of the thigh levers. Downward pressure exerted by a user's thigh to lower a first thigh activated lever causes a rocking movement of the lever support rocker which results in an upwardly movement of a second thigh activated lever.