Start: Grab a pair of dumbbells with an underhand grip, and stand with your knees slightly bent. Bend over at the hips until your torso is almost parallel to the floor. Keep your lower back slightly arched.
Finish: Pull the weights up until they're even with your lower rib cage and your elbows are higher than your torso. Keep your torso in the same position throughout, and maintain the slight bend in your knees.