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As I noted above, one of the major demands the overhead squat has is that of requiring good shoulder health. If you've got that, the arms will have the range of motion behind the neck necessary for the bottom portion of the lift. The shoulder is responsible for circumduction, or a circular rotation, and no other joint in the body has as many degrees of potential movement.
It should be your aim to have your arms remain perpendicular to the ground through the squat, with no problem to the shoulder capsule. In other words, the bar should remain above the ankles at all times. If you find it difficult to achieve this position and the bar keeps falling forward, focus on more scapular stability work, paired with stretching of the pec muscles.
Doing shoulder "dislocates" with a standard five-foot cut of PVC piping (or broomstick, if it's long enough) is also a great way to develop range of motion. Don't worry, they're not as scary as they sound. You can find PVC piping at your local hardware store, and a five-foot cut is dirt-cheap. For a couple of bucks, you can't go wrong.
To do these, hold the PVC pipe at arm's length on both ends with an overhand grip and simply rotate your straight arms all the way overhead and behind the back. Don't bend your elbows. Your finish position should be with the bar behind you, with straight arms, resting on your butt. From there, rotate your straight arms back to their starting position the same way.
If your first position is easy, move your hands two-finger widths inwards and repeat. Do two to three reps in each direction, continuously moving inwards until you can no longer complete a rep without bending your elbows to compensate.
Link:
http://www.t-nation.com/free_online_art ... _not_doingBtw:
Personligt er jeg fan af wall-slides, Scapula Pushups samt de førnævnte shoulder dislocates. Du kan læse mere i artiklen her:
http://www.marksdailyapple.com/how-to-m ... stability/