How to Build your arms with the straight bar barbell curl
Get your straight bar and the weight that you are use to. Get the technique down before you add a bunch of weight. With the straight bar in front of you bend over and grab the bar with your hands. A narrow grab, much closer then you are use to. As you raise the bar up to your chin, visualize that you are bending the bar. The movement is as if you were scooping water up to your mouth. As your hands come up think of the pinky side of the hand coming up to your nose. Also as you do this squeeze your elbows towards each other.