The ornamental design for a handexerciser, as shown and described.
FIG. 1 is a perspective view of a hand exerciser, showing my new design,
the broken line showing of the hand is for illustrative purposes only, and
forms no part of the claimed design;
FIG. 2 is a side elevational view thereof, the opposite side being
identical thereto;
FIG. 3 is a front view thereof, the rear view being identical thereto; and,
FIG. 4 is a top plan view thereof; the bottom being identical thereto.