Standing biceps cable curls

Instructions

Attach a straight bar to a low pulley.
Stand upright, knees slightly bent, back straight, and grasp the bar with an underhand (palms under the bar) shoulder-width grip. Your arms are along your body, slightly bent. This is the starting position.
By only moving the forearms, bring the bar close to your chest. The elbows and the rest of the body should stay stationary.
Hold this position for a second then slowly return to the starting position.

Muscles