An odor eliminating system utilizes an air pump to remove odors from a bowl of a toilet to a trap of the toilet. The processing significantly improves selectivity and specificity of detection objects and events. In a mode enabling the aerobic exercise, if the detected pedal effort is higher than the pedal effort level enabling the aerobic exercise, the drive unit 13 drives the electric motor 37 under the condition of the electromagnetic clutch 250 being engaged and thus assists the pedal effort with the electric force. Each of the frame leg members defines a space for suspending one or more swingable chairs from the top frame member. A locking member may be formed on the rotating drum and may cooperate with the engagement wall when the rotating drum is in the first, locked position to prevent the rotating drum from rotating with respect to the housing. The sand control screen inside the perforated shroud can be an expandable-screen type screen.