Whether performing barbell or dumbbell curls, you need to first set your back so that your shoulder blades are pulled down toward your butt and your chest is slightly raised. Let the biceps “breathe” by moving your hands slightly in front of your torso, so that your elbows are just in front of your shoulders. Once you have this stretch on the biceps, take a peek at where the biceps attaches to the shoulder to make sure that that connection point isn’t “hidden” by the dreaded forward hunch. Curl the barbell up and away from your body while keeping your shoulder blades, hips, and elbows immobile. End the repetition a few inches from your shoulders to maintain tension on the muscle, and squeeze for a few seconds at the top.