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An exercise device includes an elastic member, a bar, and a handle coupled to an end of the elastic member. The bar includes an end having an engaging hole. The end of the bar further includes at least one longitudinal slot. The bar further includes at least one transverse slot extending from an inn

An exercise device includes an elastic member, a bar, and a handle coupled to an end of the elastic member. The bar includes an end having an engaging hole. The end of the bar further includes at least one longitudinal slot. The bar further includes at least one transverse slot extending from an inner end of the at least one longitudinal slot. The handle includes a grip portion and a connecting portion. The connecting portion includes at least one protrusion. The connecting portion of the handle is releasably coupled with the engaging hole of the end of the bar, with the at least one protrusion moving along the at least one longitudinal slot and the at least one transverse slot.

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What is claimed is: 1. An exercise device comprising: an elastic member; a bar comprising an end including an engaging hole, with the end of the bar further including at least one longitudinal guiding slot having an inner end, with the bar further comprising at least one transverse slot extending f

What is claimed is: 1. An exercise device comprising: an elastic member; a bar comprising an end including an engaging hole, with the end of the bar further including at least one longitudinal guiding slot having an inner end, with the bar further comprising at least one transverse slot extending from the inner end of said at least one longitudinal guiding slot; and a handle coupled to an end of the elastic member, with the handle comprising a grip portion and a connecting portion, with the connecting portion including at least one protrusion; with the connecting portion of the handle being releasably coupled with the engaging hole of the end of the bar by moving said at least one protrusion along said at least one longitudinal slot and said at least one transverse slot; with the bar comprising another end including an engaging hole, with said another end of the bar further comprising at least one longitudinal guiding slot having an inner end, with the bar further comprising at least one transverse slot extending from the inner end of said at least one longitudinal guiding slot of said another end of the bar, with the exercise device further comprising another handle coupled to another end of the elastic member, with said another handle comprising a grip portion and a connecting portion, with the connecting portion of said another handle including at least one protrusion, and with the connecting portion of said another handle being releasably coupled with the engaging hole of said another end of the bar by moving said at least one protrusion of said another handle along said at least one longitudinal guiding slot and said at least one transverse slot of said another end of the bar. 2. The exercise device as claimed in claim 1, with said at least one protrusion of the connecting portion of said another handle comprising two diametrically opposed protrusions. 3. The exercise device as claimed in claim 2, with the protrusions of said another handle being two exposed portions of a pin transversely extending through the connecting portion of said another handle. 4. The exercise device as claimed in claim 1, with said another handle comprising a longitudinal through-hole, with said another handle further comprising two spaced flanges between the grip portion and the connecting portion of said another handle, with a slot being defined in a circumferential wall between the flanges, and with said another handle further comprising an attachment member extending through the longitudinal through-hole and the slot of said another handle. 5. The exercise device as claimed in claim 4, with said longitudinal guiding slot of said another handle having a length the same as a distance between said at least one protrusion and one of the flanges of said another handle adjacent to said at least one protrusion. 6. The exercise device as claimed in claim 4, with said another end of the elastic member comprising an end piece coupled thereto, with the end piece comprising a loop portion, and with a hook being mounted to the attachment member and including a hook portion for coupling with the loop portion of the end piece. 7. The exercise device as claimed in claim 1, with the exercise device further comprising a protective padding member mounted around the grip portion of the handle. 8. The exercise device as claimed in claim 1, with the exercise device further comprising a protective padding member mounted around the grip portion of said another handle. 9. The exercise device as claimed in claim 1, with the engaging hole of the end of the bar being an end of a longitudinal through-hole extending through the bar. 10. The exercise device as claimed in claim 1, with the bar comprising a longitudinal through-hole having two ends respectively forming the engaging holes of the bar. 11. The exercise device as claimed in claim 1, with said at least one longitudinal guiding slot on the end of the bar extending longitudinally inward from an end face of the end of the bar. 12. The exercise device as claimed in claim 1, with said at least one longitudinal guiding slot on said another end of the bar extending longitudinally inward from an end face of said another end of the bar. 13. An exercise device comprising: an elastic member; a bar comprising an end including an engaging hole, with the end of the bar further including two diametrically opposed longitudinal guiding slots each having an inner end, with the bar further comprising a transverse slot extending from the inner end of each of the longitudinal guiding slots; and a handle coupled to an end of the elastic member, with the handle including a grip portion and a connecting portion, with the connecting portion including two diametrically opposed protrusions, with the protrusions of the handle being two exposed portions of a pin transversely extending through the connecting portion of the handle, with the connecting portion of the handle being releasably coupled with the engaging hole of the end of the bar by moving each of the protrusions along one of the longitudinal guiding slots and one of the transverse slots. 14. An exercise device comprising: an elastic member; a bar comprising an end including an engaging hole, with the end of the bar further including at least one longitudinal guiding slot having an inner end, with the bar further comprising at least one transverse slot extending from the inner end of said at least one longitudinal guiding slot; and a handle coupled to an end of the elastic member, with the handle comprising a grip portion and a connecting portion, the connecting portion including at least one protrusion, with the connecting portion of the handle being releasably coupled with the engaging hole of the end of the bar by moving said at least one protrusion along said at least one longitudinal guiding slot and said at least one transverse slot, with the handle comprising a longitudinal through-hole, with the handle further comprising two spaced flanges between the grip portion and the connecting portion, with a slot being defined in a circumferential wall between the flanges, and with the handle further comprising an attachment member extending through the longitudinal through-hole and the slot of the handle. 15. The exercise device as claimed in claim 14, with the end of the elastic member comprising an end piece coupled thereto, with the end piece comprising a loop portion, and with a hook being mounted to the attachment member and including a hook portion for coupling with the loop portion of the end piece. 16. The exercise device as claimed in claim 14, with said longitudinal guiding slot of the handle having a length the same as a distance between said at least one protrusion and one of the flanges of the handle adjacent to said at least one protrusion. 17. An exercise device comprising: an elastic member; a bar comprising an end including an engaging hole; and a handle coupled to an end of the elastic member, the handle comprising a grip portion and a connecting portion; one of the end of the bar and the connecting portion of the handle including at least one longitudinal guiding slot extending longitudinally inward and at least one transverse slot extending from an inner end of said at least one longitudinal guiding slot; with the other of the end of the bar and the connecting portion of the handle including at least one protrusion, with the connecting portion of the handle being releasably coupled with the engaging hole of the end of the bar by moving said at least one protrusion along said at least one longitudinal guiding slot and said at least one transverse slot, with the bar comprising another end including an engaging hole, the exercise device further comprising another handle coupled to another end of the elastic member, with said another handle comprising a grip portion and a connecting portion; with one of said another end of the bar and the connecting portion of said another handle including at least one longitudinal guiding slot extending longitudinally inward and at least one transverse slot extending from an inner end of said at least one longitudinal guiding slot; with the other of said another end of the bar and the connecting portion of said another handle including at least one protrusion; and with the connecting portion of said another handle being releasably coupled with the engaging hole of said another end of the bar by moving said at least one protrusion along said at least one longitudinal guiding slot and said at least one transverse slot.