Abdominal exercise device

FIG. 1. Is a perspective view of my abdominal exercise device;

FIG. 2 is a right side view thereof, wherein the left side view is a mirror image thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5. Is a top view thereof; and,

FIG. 6. Is a bottom view thereof.

The broken line portions of the disclosure are for illustrative purposes only and form no part of the claimed design.

What is claimed is the ornamental design for an abdominal exercise device, as shown in the drawings herein.

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