Bend your knees slightly, and lean forward by hinging at the hips until your torso is nearly parallel to the floor, keeping your back straight and your head up.
Pull the weight up to your upper abdomen by bending your elbows and squeezing your shoulder blades together, keeping the weights as close to your body as possible.
Hold this position for a second to maximize the contraction in your back muscles.
Slowly lower the weights back to the starting position, fully extending your arms and shoulders. Repeat the exercise for your desired number of repetitions.