Position a bar in a rack to about waist height. You can also use a smith machine.
Take a wider than shoulder width grip on the bar and position yourself hanging underneath the bar. Your body should be straight with your heels on the ground with your arms fully extended. This will be your starting position.
Begin by flexing the elbow, pulling your chest towards the bar. Retract your shoulder blades as you perform the movement.
Pause at the top of the motion, and return yourself to the start position.
Set the barbell attached to the smith machine to a height that is about 2 inches below your knees.
Bend your knees slightly and bring your torso forward, by bending at the waist, while keeping the back straight until it is almost parallel to the floor. Tip: Make sure that you keep the head up.
Now grasp the barbell using an overhand (pronated) grip and unlock it from the smith machine rack. Then let it hang directly in front of you as your arms hang extended perpendicular to the floor and your torso. This is your starting position.
While keeping the torso stationary, lift the barbell as you breathe out, keeping the elbows close to the body and not doing any force with the forearm other than holding the weights. On the top contracted position, squeeze the back muscles and hold for a second.
Slowly lower the weight again to the starting position as you inhale.