Adustable Dumbbell

FIG. 1 is a top, right front perspective view of an adjustable dumbbell showing our new design;

FIG. 2 is front view thereof;

FIG. 3 is back view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings depict portions of the adjustable dumbbell that form no part of the claimed design.