The ornamental design for a weighted exerciseball, as shown and described.
FIG. 1 is a perspective view of a weighted exercise ball showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front plan view thereof, illustrating two complete panels, the weighted exercise ball is divided into eight total panels between the top and bottom sides;
FIG. 5 is a front plan view rotated upward in relation to FIG. 4 to illustrate the next two complete panels in order;
FIG. 6 is a front plan view rotated upward in relation to FIG. 5 to illustrate the next two complete panels in order; and,
FIG. 7 is a front plan view rotated upward in relation to FIG. 6 to illustrate the final two complete panels of the weighted exercise ball.