FIG. 1 shows a front perspective view of a dumbbell stand in accordance with the present design;
FIG. 2 shows a front elevation view of the dumbbell stand of FIG. 1;
FIG. 3 shows a rear elevation view of the dumbbell stand of FIG. 1;
FIG. 4 shows a right elevation view of the dumbbell stand of FIG. 1;
FIG. 5 shows a left elevation view of the dumbbell stand of FIG. 1;
FIG. 6 shows a top view of the dumbbell stand of FIG. 1; and,
FIG. 7 shows a bottom view of the dumbbell stand of FIG. 1.
The broken lines illustrate portions of the dumbbell stand that form no part of the claimed design.