My second exercise is bar cable curls. In terms of adding bulk throughout the entire biceps muscle, I find this movement to be superior (for reasons outlined previously) to the standard barbell curl.
The execution is along the same lines as that used with one arm cable curls; I maintain pressure on the biceps throughout the completion of each set and hold the weight in the midpoint position for a peak contraction. However, for the concluding tow sets, but only at every other session, I go past failure and finish the set with two or three forced reps. Just for the sake of variety, I'll substitute rope cable curls for the bar cable version twice a month.
