The ornamental design for the bunt training apparatus, as shown and described.
FIG. 1 is the top view of the bunt training apparatus showing my new design.
FIG. 2 is the bottom view thereof.
FIG. 3 is the front view thereof.
FIG. 4 is the rear view thereof.
FIG. 5 is a side view thereof.
FIG. 6 is a view of the opposite side of FIG. 5; and,
FIG. 7 is a reduced scale top view showing the bunt training apparatus in its place on a baseball diamond. The broken lines showing the baseball diamond form no part of the claimed design.