The ornamental design for an exercise apparatus for punching, as shown and described.
FIG. 1 is a right perspective view of an exercise apparatus for punching;
FIG. 2 is a left perspective view thereof;
FIG. 3 is a front perspective view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a left side view thereof, the right side view being a mirror image;
FIG. 6 is a front view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines in the drawings, which illustrate environmental structure or boundaries of the exercise apparatus for punching, do not form a part of the claimed design.