Dumbbell

FIG. 1 is a front, right and top perspective view of a dumbbell showing my new design; FIG. 2 is a rear, left and bottom perspective view thereof; FIG. 3 is a right view thereof; FIG. 4 is a left view thereof; FIG. 5 is a front view thereof; FIG. 6 is a rear view thereof; FIG. 7 is a top view thereof; FIG. 8 is a bottom view thereof; FIG. 9 is an enlarged view of a portion labeled as 9 on FIG. 1 ; FIG. 10 is an enlarged view of a portion labeled as 10 on FIG. 2 ; FIG. 11 is an enlarged view of a portion labeled as 11 on FIG. 2 ; and, FIG. 12 is an enlarged view of a portion labeled as 12 on FIG. 3 . The long dash-short dash broken lines depict enlargement boundaries that form no part of the claim.