The further handle muscle groups in the forearm, which themselves are not activated by targeted wrist curls. The results are: better grip strength after a short time, stabilization of the wrists and muscle growth. A special forearm workout, which I attended very reluctantly and rarely is accordingly no longer necessary.
As a sports student who had the good fortune to try some "training innovations," I am thrilled and have products of this kind (they exist from different manufacturers, which according to reviews only slightly different) already recommended some friends.