A therapeutic cushion system comprising: a pumping mechanism; a seat cushion (10, 210) including inflatable cells (48, 50, 52) defining at least three zones, in each zone the inflatable cells (48, 50, 52) being arranged in a serial, repeating arrangement between a front seat cushion edge and a rear seat cushion edge, and the inflatable cells (48, 50, 52) extending widthwise across the seat cushion (10, 210); the seat cushion (10, 210) further including a manifold having at least one inflation inlet in fluid communication with the pumping mechanism, and at least one deflation outlet (42, 44, 46), the manifold including fluid conduits (54, 56, 58), each fluid conduit (54, 56, 58) connected to one of the inflatable cells (48, 50, 52) in a respective one of the at least three zones, each inflatable cell being connected to the manifold by a fluid conduit; a valve assembly (36, 38, 40, 264) adjustable among at least three different valve configurations, and, in each of the different valve configurations, the valve assembly (36, 38, 40, 264) fluidly connecting some of the inflatable cells (48, 50, 52) to the at least one inflation inlet while fluidly connecting some of the inflatable cells (48, 50, 52) to the at least one deflation outlet (42, 44, 46); an electronic control unit structured to adjust the valve assembly (36, 38, 40, 264) among the at least three different valve configurations such that inflation/deflation of the inflatable cells (48, 50, 52) produces a plurality of rearwardly advancing pumping waves; and a cover including the front seat cushion edge and the rear seat cushion edge, the plurality of inflatable cells (48, 50, 52) are within the cover and the cover having a cavity formed therein adjacent the rear seat cushion edge and having the pumping mechanism positioned therein. a pumping mechanism; a seat cushion (10, 210) including inflatable cells (48, 50, 52) defining at least three zones, in each zone the inflatable cells (48, 50, 52) being arranged in a serial, repeating arrangement between a front seat cushion edge and a rear seat cushion edge, and the inflatable cells (48, 50, 52) extending widthwise across the seat cushion (10, 210); the seat cushion (10, 210) further including a manifold having at least one inflation inlet in fluid communication with the pumping mechanism, and at least one deflation outlet (42, 44, 46), the manifold including fluid conduits (54, 56, 58), each fluid conduit (54, 56, 58) connected to one of the inflatable cells (48, 50, 52) in a respective one of the at least three zones, each inflatable cell being connected to the manifold by a fluid conduit; a valve assembly (36, 38, 40, 264) adjustable among at least three different valve configurations, and, in each of the different valve configurations, the valve assembly (36, 38, 40, 264) fluidly connecting some of the inflatable cells (48, 50, 52) to the at least one inflation inlet while fluidly connecting some of the inflatable cells (48, 50, 52) to the at least one deflation outlet (42, 44, 46); an electronic control unit structured to adjust the valve assembly (36, 38, 40, 264) among the at least three different valve configurations such that inflation/deflation of the inflatable cells (48, 50, 52) produces a plurality of rearwardly advancing pumping waves; and a cover including the front seat cushion edge and the rear seat cushion edge, the plurality of inflatable cells (48, 50, 52) are within the cover and the cover having a cavity formed therein adjacent the rear seat cushion edge and having the pumping mechanism positioned therein.