Dumbbell

FIG. 1 is a perspective view of my new design, showing a dumbbell;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view of the dumbbell, showing my new design.

The line shading in FIGS. 1 - 8 represents contour and not surface ornamentation. The broken lines shown in the figures illustrate portions of the dumbbell and form no part of the claimed design.