Attach a short bar, straight or angled, to an overhead pulley. Stand with one your foot in front of the other, close to the hanging cable. 
Grasp the handle with an overhand grip. Bend your torso forward slightly and keep it still throughout the movement.
Keeping your elbows from flaring to the sides, push the handle down until your elbows are straight.
Slowly return the handle to the starting position.