Patent ID: 7160235

Claim:
A passive exercise apparatus for use by a human being in an erect, non-recumbent seating position, the apparatus comprising: a seating element having forward and rearward ends, lateral ends, an upper surface capable of supporting said human being, and a lower surface, said seating element comprising a lumbar support channel disposed toward said rearward end, lateral support channels disposed toward said lateral ends and in connection with said lumbar support channel, defining a U-shape, and a plurality of cells disposed therewithin; means for providing omni-directional movement attached to said lower surface such that when a user is seated on said seating element, said means for providing omni-directional movement results in said seating element rocking involuntarily such that muscular contraction, in the form of the combined execution of concentric and isometric muscle exertion and contractions performed while sitting on said apparatus to restore a user to an erect and stable seating position; and a base support element arranged such that said means for providing omni-directional movement is disposed between said seating element and said base support element; wherein said base support element comprises a lower base member, an upper base member and a flexible biasing means therebetween for attaching said upper base member to said lower base member.