There are a ton of forearm exercises... the one i find that burns the most is that one handle that your put a weight on the end and it has a rope and you roll it up, I forgot the name??? hold your arms out in front of you and it will burn like a motha....I also use the Captain of Crush Hand Grippers....currently ona #2.5.....forearms are not any different than any other body part... you might have limited genetics for big forearms... I have pretty strong forearms, but they are not very big like others with even less stregnth......