An exercise device upon which a user generally standing upright supported by foot platforms suspended from a frame via linkages in which the linkage lengths and pivot points correspond generally to the users upper and lower legs and hip and knee joints. The housing includes an actuator for automatically moving the armrest to the vertical position from the horizontal position as the sliding door moves between the closed and the open position. The CMY position detection circuit 2 detects the position of the CMY data in the CMY color space with respect to each dot of the CMY data. The filtered airflow is substantially the only airflow admitted to this region. A first portion of the membrane stack assembly is disposed within the cavity, and a second portion of the membrane stack assembly is wound around the central core element and forms a multilayer membrane assembly disposed around the central core element. The support elements may be integral to a mold cavity or may be removable.