Grasp a bar handle of a floor pulley with a shoulder width underhand grip. Stand facing the pulley, 1-1.5 feet from it, with your legs shoulder width apart. Bend your knees slightly.
Moving only your forearms, slowly curl the bar up to your upper chest. Keep your elbows pressed against your sides throughout the exercise.
Hold this position for a moment and slowly lower the bar. Make sure that only your forearms are moving.