Position barbell on back of shoulders from rack or clean barbell from floor with overhand grip and push press bar to back of shoulders. Hands should be slightly wider than shoulder width with torso tight.
Dip body by bending knees, hips and ankles slightly. Explosively drive upward with legs, driving barbell up off back of shoulders, vigorously extending arms over head. Return to back of shoulders and repeat.
Also see movement in Slow Motion.