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The ornamental design for a sit up exercise machine, as shown and described.
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FIG. 1 is a perspective view showing the design of my invention.
FIG. 2 is a elevational view of from the right side.
FIG. 3 is an elevational view of from the left side.
FIG. 4 is a front elevational view.
FIG. 5 is a rear elevational view.
FIG. 6 is a top plan view; and,
FIG. 7 is bottom plan view.
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