A reclinable chair comprising a seat bottom and seat back rest, the seat bottom and seat back rest each incorporating at least one self-inflating device which further comprise: an envelope defining a closed space, a compressible material contained within the envelope, and valve means adapted to allow air into the envelope so that the compressible material can expand to enlarge the self-inflating device and to allow air out of the envelope so that the material may be compressed and the self-inflating device reduced in size, the valve means comprises a control valve for controlling the degree of compression of the at least one self-inflating device and wherein the control valve further comprises a valve stem and a valve seat formed in the valve body and adapted to form a valve seal therebetween when the control valve is closed, an actuator which whilst actuated separates the valve stem and valve seat to permit air flow into and out of the air channels formed in the valve body for adjustment of the volume of air within the device and locking means for maintaining the control valve fully open when it is desired to fill the device with air or empty it of air, wherein the control valve is controlled by a single controller so that the chair has at least two self-inflatable devices each with its own single controller to control the inflation and deflation of each self-inflatable device, wherein the single controllers are collocated adjacently as remote control valves to facilitate easy access and control of the at least two self-inflatable devices, and the reclinable chair is configured so that the occupant of the reclinable chair is able to adjust the recline of the seat back rest and the degree of compression of the self-inflating device of the seat bottom and seat back rest by operating the at least two single controllers to: hold the buttocks in place, provide individual pelvic support and, tilt the pelvis forward so that the spine is lengthened in a gentle S-shape. an envelope defining a closed space, a compressible material contained within the envelope, and valve means adapted to allow air into the envelope so that the compressible material can expand to enlarge the self-inflating device and to allow air out of the envelope so that the material may be compressed and the self-inflating device reduced in size, the valve means comprises a control valve for controlling the degree of compression of the at least one self-inflating device and wherein the control valve further comprises a valve stem and a valve seat formed in the valve body and adapted to form a valve seal therebetween when the control valve is closed, an actuator which whilst actuated separates the valve stem and valve seat to permit air flow into and out of the air channels formed in the valve body for adjustment of the volume of air within the device and locking means for maintaining the control valve fully open when it is desired to fill the device with air or empty it of air, wherein the control valve is controlled by a single controller so that the chair has at least two self-inflatable devices each with its own single controller to control the inflation and deflation of each self-inflatable device, wherein the single controllers are collocated adjacently as remote control valves to facilitate easy access and control of the at least two self-inflatable devices, and the reclinable chair is configured so that the occupant of the reclinable chair is able to adjust the recline of the seat back rest and the degree of compression of the self-inflating device of the seat bottom and seat back rest by operating the at least two single controllers to: hold the buttocks in place, provide individual pelvic support and, tilt the pelvis forward so that the spine is lengthened in a gentle S-shape. hold the buttocks in place, provide individual pelvic support and, tilt the pelvis forward so that the spine is lengthened in a gentle S-shape.