[Spook]

You should be able to do forearms are your normal arm or shoulder days. When doing biceps you will get some forearm work there just as nature, but you can add in dumbbell wrist curls, reverse wrist curls, or even barbell wrist curls with no weights on the barbell. You can throw in 2-3 sets of wrist curls and 2-3 sets of reverse wrist curls. There is another you might try which will work fairly well, but for the life of me, I can't remember the name of the exercise; you basically grasp the dumbbells and with your elbows on you knees while sitting on the bench, you essentially rotate the weight back and forth in a controlled movement with your wrists. Trust me, you will feel a nice burn and it is great for stabilizers and connective tissues.