The ornamental design for a hand grip, as shown and described.
FIG. 1 is a front elevational view of a hand grip showing my new design;
FIG. 2 is a side view thereof;
FIG. 3 is a rear view thereof; and,
FIG. 4 is a top view thereof.
The side not illustrated is a mirror image of the side illustrated in FIG. 2, the bottom is plain and unornamented and the shaft illustrated in dashed lines does not form part of the claimed design.