FIG. 1 is a perspective view of the abdominal exercise apparatus shown attached to an inclinable exercise device;

FIG. 2 is a perspective view of the abdominal exercise apparatus shown attached to the inclinable exercise device, similar to FIG. 1, and shows a user on the inclinable exercise device and using the abdominal exercise apparatus;

FIG. 3 is a rear elevational view of the abdominal exercise apparatus;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a top plan view thereof;

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

FIG. 8 is a left side elevational view thereof.

The broken lines are for environmental purposes only and form no part of the claimed design. The inclinable exercise device and the user form no part of the claimed design.