| It's more to do with encapsulating that shoulder joint in a protective covering of muscle. With equi-tension in all directions.
When the shoulder girdle is developed properly (in a balanced way) I'd expect the joint itself is equally & well supported.
If the shoulder is unbalanced (front, back or side in the case of Delts)
when the impact strikes, from whatever angle, the joint is moved obviously, but the force will go towards the weakness (as this is where that energy can go there unopposed).
Thats when you get hurt.
What do you think Nat? |