Start with the arms straight. The Weight is on the floor in front of you. The body erect with head up and vertebrae in alignment.
Concentric contraction: Breathe out as you begin the lift by Driving with the legs, then straighten up into an upright position, throw the chest out and the shoulders back.
Eccentric contraction: Breathe in. Lower the bar with control. Bend the knees and the pelvis will automatically move backwards. Ensure the arms are kept straight and the back straight and strong.