I'd like bigger forearms but I don't know can you increase them with direct work, I do know grip will increase but Im not sure it 'grows' forearms. I have tried Wrist extensions and curls never noticed them bigger, (don't do them anymore) but if they are gaining size it must be from everything else I'm doing. When I reach my 16inch guns (my goal) I don't want to have tiny forearms though.... Meh they better grow with the arms
There's a good 3 inch difference from forearm to upper currently.