The invention is an ergonomic support seat cushion, the top surface of which is uniquely shaped and which can be used for seated exercise, stretching and self-massage.The cushion includes contours derived using the mathematical equations based in the Golden Ratio (φ) and certain proportions based in the Rule of Thirds. The size of the support cushion can be varied proportionally to the size of the person. The width shape of the device comes in different versions, each maintaining Golden Curves and Rule of Thirds proportions. The wider versions of the cushion have holes for the two Sitz bones in the pelvis. The support seat cushions for males versus females have differences to account for dimorphism of the pelvis. The unique dimensional curvatures of the invention can be incorporated within devices that have seats.
