Place a barbell in a rack at approximately shoulder-height. Dip under the bar so that it rests behind the neck across the top of the back and shoulder blades, and grip the bar with the hands a little wider than shoulder-width apart. Lift the chest and squeeze the shoulder blades together to keep the back straight the entire movement. Stand up to bring the bar off the rack and take 2 steps backwards. Place both feet so that they are about hip-width apart, and step forward with the right leg. Lower the left knee almost to the floor without touching the ground. From the bottom of the movement push the right foot into the floor and pull back with the left leg to stand up. Alternate the legs for the desired number of repetitions.