Finish the following sentence with the best choice: How to perform a  barbell curl?

Choices:
- 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.
- 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:
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.