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A collapsible exercise weight comprises a first end wall portion, a second end wall portion and a peripheral outer wall that together define a substantially hollow interior. A capped aperture permits the ingress of water into and the egress of water from the substantially hollow interior. A handle c

A collapsible exercise weight comprises a first end wall portion, a second end wall portion and a peripheral outer wall that together define a substantially hollow interior. A capped aperture permits the ingress of water into and the egress of water from the substantially hollow interior. A handle connector is for connecting the collapsible exercise weight to a handle. The peripheral outer wall comprises a plurality of wide diameter bellows folds and a plurality of narrow diameter bellows folds disposed alternatingly one with the other. The wide diameter bellows folds and the narrow diameter bellows folds are each movable between an expanded configuration and a collapsed configuration. The narrow diameter bellows folds at least partially fit within adjacent ones of the wide diameter bellows folds when the narrow diameter bellows folds are in the collapsed configuration.

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1. A collapsible exercise weight comprising: a first end wall portion;a second end wall portion disposed in spaced relation from said first end wall portion;a peripheral outer wall secured in sealed relation to said first end wall portion and said second end wall portion and extending therebetween,

1. A collapsible exercise weight comprising: a first end wall portion;a second end wall portion disposed in spaced relation from said first end wall portion;a peripheral outer wall secured in sealed relation to said first end wall portion and said second end wall portion and extending therebetween, to together define a substantially hollow interior;an aperture in one of said first end wall portion and said second end wall portion to permit the ingress of water into and the egress of water from said substantially hollow interior;a removable and replaceable cap for sealing off said aperture;wherein said peripheral outer wall comprises a plurality of wide diameter bellows folds and a plurality of narrow diameter bellows folds disposed alternatingly one with the other;wherein said wide diameter bellows folds and said narrow diameter bellows folds are each movable between an expanded configuration and a collapsed configuration;the wide diameter bellows folds comprise curved outer peripheral portions and the narrow diameter bellows folds comprise curved outer peripheral portions; and,wherein said narrow diameter bellows folds at least partially fit within adjacent ones of said wide diameter bellows folds when said narrow diameter bellows folds are in said collapsed configuration. 2. The collapsible exercise weight of claim 1, further comprising handle connection means disposed on one of said first end wall portion and said second end wall portion for connecting said collapsible exercise weight to a handle. 3. The collapsible exercise weight of claim 1, wherein said first end wall portion, said second end wall portion and said peripheral outer wall are integrally formed one with the other. 4. The collapsible exercise weight of claim 1, wherein said first end wall portion and said second end wall portion are, substantially rigid. 5. The collapsible exercise weight of claim 1, wherein said first end wall portion and said second end wall portion are each substantially circular. 6. The collapsible exercise weight of claim 5, wherein said narrow diameter bellows folds are each substantially the same diameter one as the other. 7. The collapsible exercise weight of claim 6, wherein said wide diameter bellows folds are each substantially the same diameter one as the other. 8. The collapsible exercise weight of claim 7, wherein said first end wall portion and said second end wall portion are each substantially the same diameter one as the other. 9. The collapsible exercise weight of claim 8, wherein said wide diameter bellows folds are each substantially the same diameter as said first end wall portion and said second end wall portion.