Set-up: Find a cable tower and an attachment that will allow for a shoulder-width grip. Take a shoulder-width overhand grip on the bar and establish a tight midsection and a neutral spine. Keep your elbows fixed approximately 20-30 degrees.
Lift: Keeping your elbows fixed at 20 to 30 degrees, with your core tight and stable - pull the bar down until it reaches just above the knees. Return the weight back to the starting position under control.
Emphasis: Do not swing, or use the weight of your torso to cheat the movement - your back should move very little from the starting position.