This invention relates to a magnetic head device and a disk drive, which are suitable for application to a mass-storage floppy disk drive or the like. Mounted to the frame are a rear wheel assembly and a transmission assembly. The components of this invention are an enclosed cycling mechanism with pedals extended from the housing, situated upon a support structure and combined with a separate forward-extending adjustable extension supporting hand-grips and arm-cushions, the overall mechanism requiring that the user’s body be supported by the arms during cycling in each of the allowable body orientations.