Patent ID: 8282171

Claim:
A seat assembly for improving posture of a user, comprising: a base portion; a substantially rigid seat to provide proprioceptive feedback to said user, said seat having a substantially planar upper surface and shaped to support undersides of a user's thighs and said seat supported by said base portion in a position always angled downwardly from rear to front; a substantially vertical one-piece back support extending upwardly in a rear area of said seat, said substantially vertical back support supported by at least one of said seat and said base portion; said seat comprising a passageway for passage of said substantially vertical back support from below said seat to above said seat, said passageway centrally positioned between opposite lateral sides of said seat and defining multiple back support locations between said rear and said front of said seat; and, a pad positioned on said back support, said back support having a portion passing through said passageway and selectively positionable to one of said multiple back support locations for varying seat depth and said pad having a convex surface extending toward a user's back and being convex about a vertical axis for engaging a user's thoracic spine area.