| 摘要 |
A dumbbell comprises a bar that extends generally axially between opposing end regions, a weight plate mass mounted about the bar at each end region, means for retaining the mounted weight plate mass at the respective end regions to define a handle region axially inward of the end regions that can be gripped by a user during exercise movement of the dumbbell, means for mechanically securing the weight plate mass to the dumbbell, said bar extending sufficiently axially outward of the mechanically secured weight plate mass to accommodate an incremental weight plate mounted about the bar axially outward of the mechanically secured weight plate mass, means for magnetically securing a magnetically responsive incremental weight plate to the dumbbell via magnetic attraction unless the mounted incremental weight plate has been rotated about the bar to a decoupling position, and means for establishing a decoupling position in which there is no magnetic attraction between the mounted incremental weight plate and the dumbbell so that the incremental weight plate can be removed from the dumbbell without overcoming the force of magnetic attraction.
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