I have know for a long time that people hold the bar incorrectly overhead. More recently I started putting together that holding the bar incorrectly negatively affects the shoulders. The other day when people were overhead squatting, I made them use a thumbless grip. This caused everyone to extend their wrists and press their palms up toward the ceiling and into the barbell. This also facilitated the external rotation of the shoulders. People’s overhead positions were immediately improved by this. It’s such a simple fix. It’s amazing. It is also extremely helpful for the BTN push press and the snatch balance where the elbows must be pointed down for a good line of action with the bar.