After my back routine on Tuesday, I add some isolation biceps work. Usually it's something along the lines of one-arm DB preacher curls, alternating incline DB curls, or concentration curls. I'll do 4-6 total sets for biceps depending on what I'm feeling that day, and how intense I plan to be with those sets.
I work my biceps again on Friday, along with triceps and forearms. I don't work them to a great degree, because my biceps have already gotten pounded on Tuesday, and my triceps are worked on Mondays with chest, and Thursdays with shoulders. Forearms are also worked a lot during the week, especially with back. But I still like to give them some independent training.
My arms workout is usually my most dynamic routine: I switch it up often. Usually I'll start with a triceps exercise such as close-grip bench or dips, followed by barbell curls (with an arm blaster if you have one), then a couple supersets of triceps/biceps. This is followed by freestyle reverse pushup sets, and then finished with forearm training.
Some of the biceps exercises I like to use include:
Standing Curls (with arm blaster if available)
Seated Incline DB Curls
Standing Cable Curls
Preacher Curls
Pullups (close-grip and underhanded)
I hold the contraction at the top of every curl movement for a moment, which makes the muscles work harder, pumps more blood into the muscle, and causes more forceful contractions and muscle fiber recruitment. After each set of biceps I'll pronate and supinate my wrist a few times, followed by flexing my biceps for about 10-15 seconds, and then some rest before the next set (I wait about 1-1.5 minutes between sets). After my biceps workout I'll stretch for a little bit, followed by flexing for about 1 minute. Then I'll go between stretching and flexing in different ways to finish off. I go for mass, but I want improved muscle definition along the way. With the results I've been seeing personally, I think I'm achieving this. My arms and shoulders are especially lean in appearance, as most of the excess body fat I have is stored elsewhere, so more definition shows through. Flex between sets, and flex after workouts! You'll notice a difference over time. If anything, it helps improve muscle control.