The ornamental design for an exercisematholder, as shown and described.
FIG. 1 is a perspective drawing showing an exercise mat supported from
several of my new exercise mat holders and wherein the matter shown in
dashed line comprises no part of my invention;
FIG. 2 show a front view of my design for an exercise mat holder;
FIG. 3 shows a top view thereof;
FIG. 4 shows a bottom view thereof; and,
FIG. 5 shows a right side view thereof and wherein the left side view is
identical.