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