I cant tell you how many people I have seen at the gym with great bi/tri developement but lanky forearms. Your forearms serve a much greater purpose than looking good. Grip strength, which is essential to weight lifting comes from strong forearms. Many have posted about forearms giving out during back, bi workouts and the simple reason is lack of direct work. Training forearms twice per week will balance your upper arm out as well as greatly improve your back and bi workouts. In fact you will notice differences in lateral raises as well. Crucial to well developed forearms also, is to work the upper portion and belly of the muscle. Reverse grip curls are great for the top of the forearm and the staple wrist curl is a must for belly developement. I prefer resting my arms on a bench for this movement. The key is to do a lot of reps. 3 sets of 20 reps for upper and 3 sets of 20 for lower. Try this for 2-3 months and you'll never wear a long sleave shirt again. LOL