The ornamental design for an exercise apparatus for forearms, as shown and described.
FIG. 1 is a perspective view of an exercise apparatus for forearms showing my new design, wherein the cable is in partially assembled state;
FIG. 2 is a front elevation view, wherein, the rear view being a mirror image thereof; and,
FIG. 3 is an enlarged left side elevation view thereof, wherein the cable is in a fully assembled state, the right side view is a mirror image thereof.
The broken line showing of the weight in FIG. 1 is for illustrative purposes only and forms no part of the claimed design.