| 摘要 |
A plurality of weights is provided. Each weight has a central primary aperture and primary slot. Each weight has a major section and an axially offset secondary minor section. The minor section is formed with a secondary aperture and a secondary slot. A weight-lifting shaft has a plurality of cam plates. An adjustment knob is provided at each end of the shaft. Each cam plate is an irregularly shaped polygon with radially enlarged sections. In this manner cam surfaces are provided at maximum radii greater than the radii of the remainder of the cam plate. The radially enlarged sections are adapted to releasably couple selectively with the secondary aperture of the weights.
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