Abstract: An exercise device for strengthening the core or midsection of the body that is suitable for use in a professional work environment. The exercise device comprises a domed seat positioned atop a plurality of baffled sections. The domed seat is deformable, allowing it to support and conform to the buttocks of a user when sitting on the device. The baffled sections are also deformable, allowing the seat to shift in all directions along a horizontal plane as a user's weight naturally shifts while sitting on the device. As the baffled sections deform and the seat persistently shifts over the course of a given period of time, a user's core muscles repeatedly tense in order to stabilize the body. The constant tension of the muscles over that period of time simulates a workout, particularly in the midsection of the body.