The ornamental design for a swimmingring, as shown and described.
FIG. 1 is a perspective view of a swimming ring showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines in the drawing depicting the center of the swimming ring shown in FIG. 7 are for illustrative purposes only and form no part of the claimed design.