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The ornamental design for a sit up exercise support, as shown and described. |
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FIG. 1 is a perspective view illustrating my design for sit up exercise support;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right side elevation view thereof; the left side elevation view is a mirror image thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
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