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The ornamental design for a sit-up exercise device, as shown and described. |
FIG. 1 is a perspective view of a sit-up exercise device showing my new design;
FIG. 2 is a side elevational view thereof;
FIG. 3 is a front elevational view thereof shown partially in fragment for ease of illustration;
FIG. 4 is a top plan view thereof;
FIG. 5 is a rear elevational view thereof; and,
FIG. 6 is another front perspective view thereof with the cushion members shown in an exploded condition.
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