| 摘要 |
A platform has upper and lower surfaces with upper, lower and side edges. A primary support bar has upper and lower ends. The primary support has a linear major extent and an arcuate minor extent. A cylindrical rear cross bar is coupled to the minor extent. A secondary support bar has upper and lower ends. A cylindrical front cross bar is coupled to the secondary support bar adjacent to the platform. A hinge has an axis of rotation coupling the secondary support bar to the primary support bar. A supplemental support bar has upper and lower ends. The lower end is slidably received in the secondary support bar. Knee cylinders extends laterally with respect to the supplemental support bar adjacent to its upper end. A pair of instep cylinders is provided. A bar rotatably receives the instep cylinders. A foot hinge pivotably couples the small bar to the secondary support bar.
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