The ornamental design for a wellnessball, as shown and described.
FIG. 1 is a perspective view of a wellness ball, the perspective view partially from the front of the wellness ball, partially from a left side of the wellness ball, and partially from a top of the wellness ball;
FIG. 2 is a front view of the wellness ball of FIG. 1; and,
FIG. 3 is a top view of the wellness ball of FIGS. 1.
A left side view, a right side view, and a back view of the wellness ball of FIG. 1 are identical to the view of FIG. 2. A bottom view of the wellness ball of FIG. 1 is identical to the view of FIG. 3.
The broken lines in the embodiments of FIG. 3 are provided for context only, and form no part of the present design.