Abstract: An apparatus is disclosed having a generally U-shaped horizontal top rail delineating the front and two sides of the apparatus, the rear of the apparatus being open. Four legs depend from the top rail in the general form of a cubic trapezoid delineating the four upright edges of the apparatus. A seat is pivotally mounted to a first of the four legs and is lockingly engageable with the second of the four legs thereby closing the rear of the apparatus. A knee pad is located between the third and fourth legs and situated with respect to the seat so as to permit the user of the apparatus to assume a standing or a semi-sitting position.