| 摘要 |
An exercise device is provided in the form of a central platform having two extensible wings which together with the supporting surface of floor on which the exercise device is supported forms along with the central platform a series of steps. The wings are spring loaded and controllable by a calibrated turnkey which enables the wings to be extended a determinable amount which correlates to the height of the individual using the device for purposes of exercise. To use the device, the exercising individual stands on the central platform and moves his feet from step to step, first down and then up, with the option of alternating between the user's two feet.
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