Q: My biceps are big, but my triceps are underdeveloped, even though I've spent plenty of time training them. What should I do?
A: Underdeveloped triceps are one of the most common problems among beginning and intermediate bodybuilders, but one that is accompanied with a 100% cure rate for those who are serious about solving it. In order for that to happen, however, keep the following in mind.
Bodybuilders don't train what they can't see. At the next contest you watch, notice that the most neglected bodyparts among competitors are their lats, erectors, upper back and traps, rear delts, biceps brachialis, hamstrings, calves and triceps. That's because they tend to train hardest those bodyparts they see in the mirror when they pose, namely, biceps, chest, front delts and quads.
Biceps and triceps should not be trained alike. The assumption is that since biceps and triceps are on opposite sides of the same limb, they are equals and should therefore be trained equally. I shouldn't have to tell you that every muscle group in your body is unique and should be trained accordingly. Triceps, as a larger muscle group than biceps, need to be trained much harder and heavier, and with more volume and compound movements, if you expect them to grow at the same rate.
Just because your triceps have fallen behind your biceps doesn't mean you should back off your biceps workouts. Your objective is not to reduce your biceps so they are proportional with your triceps, but to increase your triceps so they are proportional with your biceps.
To make up for lost size, train your triceps twice a week, with chest on one day and with shoulders three days later. Your training schedule could be as follows: chest and triceps on day one, back and biceps on day two, legs on day three, shoulders and triceps on day four, rest on day five, then repeat.
Until your triceps have closed the gap, hit them heavy and hard with at least 16 sets per workout, with a rep range of eight to 10. A good workout would be close-grip bench presses, seated one-arm dumbbell extensions, triceps pressdowns and dips. Every three or four weeks, throw in a shock routine, going through one of these workouts in giant-set fashion: one set of each exercise nonstop, in a round-robin format, until you've completed all four sets of all four exercises -- 16 sets nonstop.
With every repetition, get the fullest range of motion possible (this is more crucial for triceps than for any other bodypart) and take each set to failure, which means not being able to complete a full rep. Summon your maximum intensity, power, strength and endurance for this new program, then make sure you never again fall below that level.