Perform a squat while supporting a barbell overhead. Starting from a fully erect postion, lower yourself, and the barbell, to a position where the crease in your hips rests lower than the height of your knees, and stand back up. Safe/efficient technique requires a very upright torso when squatting so that the barbell stays over the middle of the feet. Any deviation from upright will require adjustments to the bar. As the torso creeps forward, slightly pull the bar backwards in order to maintain balance. Use a wider "snatch" grip for greater shoulder range of motion. The tighter your shoulders, the wider you'll need to go. The overhead squat can also be found during the full snatch.