STARTING POSITION:
You need to find a cable crossover and place the pulleys at the highest level. Select the appropriate resistance in the weight stack. Stand straight between the pulleys with your feet shoulder width apart. Grab a handle with each hand. Use a supine grip. Contract your pelvic floor and core while keeping your chest up.
MOVEMENT:
Contracting your biceps, fully bend your elbows while you exhale. Make sure you only move the forearms. Return to the starting position in a smooth movement while you inhale. The moving weights should not touch the rest of the stack.
TIPS: The exercise key is quality over quantity. The trick is to perform the exercise using proper form.