The ornamental design for an exercisemathanger, as shown and described.
FIG. 1 is a perspective view of the mat hanger;
FIG. 2 is a perspective view of the mat hanger in an environment of attachable hooks, shown here and in subsequent FIGs. in broken lines, which are not part of the design;
FIG. 3 is a front view of the mat hanger;
FIG. 4 is a back view;
FIG. 5 is a bottom view;
FIG. 6 is a top view;
FIG. 7 is a left side elevation view with the clip in the closed position; the right side view is a mirror image;
FIG. 8 is a left side elevation view with the clip in the open position; and,
FIG. 9 is a perspective view of the hanger, hung by hooks over a door and suspending an exercise mat, which are environmental structure shown in broken lines for illustrative purposes only.