Grab a straight or curved bar evenly and stand tall. Bring your shoulders back, squeeze your glutes, and take a breath.
Curl the weight halfway (to the point where your wrists align with your elbows) for seven repetitions.
Immediately start curling the bar from the halfway point to the top (where your wrists are a couple of inches higher than your elbows) for another seven repetitions.
Finish by doing seven complete repetitions from full arm extension to the top position, breathing steadily as you do.