FIG. 1 is a front perspective view of a posture chair of the invention;
FIG. 2 is a slightly enlarged front elevation view of a posture chair;
FIG. 3 is a slightly enlarged rear elevation view of a posture chair;
FIG. 4 is a slightly enlarged side elevation view of a posture chair;
FIG. 5 is a slightly enlarged top plan view of a posture chair; and,
FIG. 6 is a slightly enlarged bottom plan view of a posture chair.