Grip the barbell about shoulder-width apart. Begin by holding the bar slightly above your knees with a slight bend in your arms. Bring the bar up to shoulder height and squeeze your biceps at the top of the rep. Try as hard as you can to keep your elbows in the same position. If you have too much weight on the bar or you start getting tired, you might want to start swinging the barbell. Instead, simply reduce the weight so you can do a good rep.