FIG. 1 is a top perspective view of an embodiment of a dumbbell showing our new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a back elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a partially exploded view thereof;
FIG. 9 is a top perspective view of an alternative embodiment of a dumbbell showing our new design;
FIG. 10 is a front elevation view thereof;
FIG. 11 is a back elevation view thereof;
FIG. 12 is a left side elevation view thereof;
FIG. 13 is a right side elevation view thereof;
FIG. 14 is a top view thereof;
FIG. 15 is a bottom view thereof;
FIG. 16 is a partially exploded view thereof;
FIG. 17 is a top perspective view of an alternative embodiment of a dumbbell showing our new design;
FIG. 18 is a front elevation view thereof;
FIG. 19 is a back elevation view thereof;
FIG. 20 is a left side elevation view thereof;
FIG. 21 is a right side elevation view thereof;
FIG. 22 is a top view thereof;
FIG. 23 is a bottom view thereof;
FIG. 24 is a partially exploded view thereof;
FIG. 25 is a top perspective view of an alternative embodiment of a dumbbell showing our new design;
FIG. 26 is a front elevation view thereof;
FIG. 27 is a back elevation view thereof;
FIG. 28 is a left side elevation view thereof;
FIG. 29 is a right side elevation view thereof;
FIG. 30 is a top view thereof;
FIG. 31 is a bottom view thereof;
FIG. 32 is a partially exploded view thereof;
FIG. 33 is a top perspective view of an alternative embodiment of a dumbbell showing our new design;
FIG. 34 is a front elevation view thereof;
FIG. 35 is a back elevation view thereof;
FIG. 36 is a left side elevation view thereof;
FIG. 37 is a right side elevation view thereof;
FIG. 38 is a top view thereof;
FIG. 39 is a bottom view thereof;
FIG. 40 is a partially exploded view thereof;
FIG. 41 is a top perspective view of an alternative embodiment of a dumbbell showing our new design;
FIG. 42 is a front elevation view thereof;
FIG. 43 is a back elevation view thereof;
FIG. 44 is a left side elevation view thereof;
FIG. 45 is a right side elevation view thereof;
FIG. 46 is a top view thereof;
FIG. 47 is a bottom view thereof;
FIG. 48 is a partially exploded view thereof;
FIG. 49 is a top perspective view of an alternative embodiment of a dumbbell showing our new design;
FIG. 50 is a front elevation view thereof;
FIG. 51 is a back elevation view thereof;
FIG. 52 is a left side elevation view thereof;
FIG. 53 is a right side elevation view thereof;
FIG. 54 is a top view thereof;
FIG. 55 is a bottom view thereof; and,
FIG. 56 is a partially exploded view thereof.
The broken lines illustrate portions of the drawings that form no part of the claimed design. The stippling in the drawings illustrate contrasting color or texture in the design, without a claim to a specific color or texture. The dumbbell is shown with a long-short-long dashed symbolic break in its length. The appearance of the break lines and any portion of the dumbbell between the break lines forms no part of the claimed design.