The ornamental design for a jumprope, as shown and described.
FIG. 1 is a front elevational view of a jump rope showing my new design;
FIG. 2 is a rear elevational view of FIG. 1;
FIG. 3 is a left side elevational view of FIG. 1;
FIG. 4 is a right side elevational view of FIG. 1;
FIG. 5 is a top plan view of FIG. 1;
FIG. 6 is a bottom plan view of FIG. 1; and,
FIG. 7 is a perspective view of FIG. 1.
The claimed design is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.