This invention relates to an exercise device and more particularly to an exercise device of the type that allows the user of the exercise device to exercise with part of their body in a negative pressure environment. These devices are becoming increasingly popular however the known devices are prone to frequent failure. The present invention provides a construction of exercise device that reduces the incidences of failure caused by failure of the electronics panel. The electronics panel being mounted in a separate dedicated enclosure internal the chamber with the negative pressure environment, the interior of the dedicated enclosure is isolated from the negative pressure conditions and atmosphere in the remainder of the chamber. The exercise device will be more reliable and cost effective to run. Furthermore, the construction of the present invention permits easier access to the interior of the casing for maintenance when maintenance is required.