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The ornamental design for a sit-up exerciser, as shown and described. |
FIG. 1 is a front, left side and top perspective view of a sit-up exerciser, showing my new design;
FIG. 2 is a left side view thereof, the opposite side view being a mirror image;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a top view thereof; and,
FIG. 6 is a bottom view thereof.
The broken line showing of the handle bar is for illustrative purposes only and forms no part of the claimed design.
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