Question: How to perform a  barbell curl?
Option 0: Stand straight, with the barbell held in the hands, arms resting. Bend your arms at the elbow joint, to lift the barbell to a flat angle, and then lower it back down and repeat.
Option 1: Stand straight, with the barbell held in the hands, arms resting. Bend your arms at the shoulders, to lift the barbell to a flat angle, and then lower it back down and repeat.
Answer: 0