The best way to build bigger biceps is to incorporate a few different types of curls that each trains the muscles in a different fashion. It is important to note that the term biceps refers to two different muscles (long head and short head) and by diversifying your workout and attacking your arms with various approaches; you can be assured that your arms will get a comprehensive workout. The most grueling biceps training routine is performed with the use of supersets. The concept behind doing super-sets is that there is almost no rest between sets, causing your muscles to overload- thus triggering growth. I suggest using a three or four station rotation. I have always performed a three-station routine. I prefer to do this workout with a partner for two reasons; motivation and timing. Bicep workouts cause a lot of pain, and the extra motivating force, that comes from working out with a competitive partner, provides the extra boost that I need to push my body hard enough to finish the workout. When working with a partner, I begin my rotation just as my workout partner finishes theirs. The competition that comes as a result of taking turns shortens the rest period between sets, making the workout more challenging and thus more effective.