We claim the ornamental design of a hockey training device, as shown and described.
FIG. 1 is a front view of a hockey training device showing our new design, being shown in use with an unclaimed net;
FIG. 2 is a front view;
FIG. 3 is a top view of of FIG. 2;
FIG. 4 is a side view of FIG. 2;
FIG. 5 is a side view of FIG. 2;
FIG. 6 is a bottom view of FIG. 2; and,
FIG. 7 is a rear view FIG. 2.
The broken lines are included for the purpose of illustrating features of the hockey training device that form no part of the claimed design or features of an environment in which the hockey training device can be used that form no part of the claimed design.