Abstract: A flexible resilient seat back, a chair including the seat back and methods of using the chair. The seat back includes an integral sheet material having rigidity sufficient to maintain its shape absent a deforming force; the sheet material having relatively upper and lower portions considered in a direction from top toward bottom, an area of the sheet material approximately at the juncture of the upper and lower portions protruding more forwardly than the major extent of the upper and lower portions, and the sheet material resiliently flexible permitting limited (controlled) deformation during use generally in a prescribed manner in response to force to bend the upper portion of the sheet material relative to the lower portion in a direction front to back and/or in a sidewise direction while supporting the back of the user. A method using and exercising using the chair with seat back.

Abstract: A seat cushion for a chair or separately usable, includes a support base having a top and bottom, a fluid bladder supported by the support base above at least part of the top of the support base, the fluid bladder having a fluid chamber forming plural bladder sections, a biasing member in the fluid chamber tending to bias the fluid chamber to an at least partly expanded condition, a resilient retaining covering over the fluid bladder holding the fluid bladder on the support base, a valve mechanism in fluid coupled relation to the fluid bladder to provide and to exhaust fluid from the fluid chamber, a mechanical connection of the valve mechanism to the support base, mechanical coupling and restricted fluid flow coupling of the bladder sections. A seating apparatus, e.g., a chair, including the seat cushion. A bladder-type fluidic seat cushion in a kit.

Abstract: A flexible resilient seat back, a chair including the seat back and methods of using the chair. The seat back includes an integral sheet material having rigidity sufficient to maintain its shape absent a deforming force; the sheet material having relatively upper and lower portions considered in a direction from top toward bottom, an area of the sheet material approximately at the juncture of the upper and lower portions protruding more forwardly than the major extent of the upper and lower portions, and the sheet material resiliently flexible permitting limited (controlled) deformation during use generally in a prescribed manner in response to force to bend the upper portion of the sheet material relative to the lower portion in a direction front to back and/or in a sidewise direction while supporting the back of the user. A method using and exercising using the chair with seat back.

Abstract: A seat cushion for a chair or separately usable, includes a support base having a top and bottom, a fluid bladder supported by the support base above at least part of the top of the support base, the fluid bladder having a fluid chamber forming plural bladder sections, a biasing member in the fluid chamber tending to bias the fluid chamber to an at least partly expanded condition, a resilient retaining covering over the fluid bladder holding the fluid bladder on the support base, a valve mechanism in fluid coupled relation to the fluid bladder to provide and to exhaust fluid from the fluid chamber, a mechanical connection of the valve mechanism to the support base, mechanical coupling and restricted fluid flow coupling of the bladder sections. A seating apparatus, e.g., a chair, including the seat cushion. A bladder-type fluidic seat cushion in a kit.