I claim the ornamental design for an exercise band connector, as shown and described.
FIG. 1 is a perspective view of an exercise band connector according to the present design;
FIG. 2 is a top view of the exercise band connector;
FIG. 3 is a front view of the exercise band connector, the back view being a mirror image thereof;
FIG. 4 is a bottom view of the exercise band connector;
FIG. 5 is a left side view of the exercise band connector, the right side being a mirror image thereof;
FIG. 6 is a perspective view of the exercise band connector with a portion of an exercise resistance band shown in phantom lines, the exercise resistance band forming no part of the claimed design; and,
FIG. 7 is a further view of the exercise band connector with a portion of the exercise resistance band shown in phantom lines, the exercise resistance band forming no part of the claimed design.