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The ornamental design for a sit-up exerciser, as shown and described. |
FIG. 1 is a perspective view of a sit-up exerciser, showing my new design;
FIG. 2 is a front elevational view thereof, the rear being a mirror image of the front shown in FIG. 2;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom view thereof.
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