I really like "thread the needle" rotational side planks for their ability to hit the stabilizers / rotators harder and work on thoracic rotation all in one move.
That movement pattern is awesome for your shoulders IMO.
I AM NOT A HEALTHCARE PROFESSIONAL, but these are all
anecdotes from my experience and extensive personal research:
-Doing cuban rotations/press in varying angles helped my shoulder a lot after surgery.
-SERRATUS SLIDES. This drill is
especially important for HSPU or overhead pressing movements and also definitely helped me regain most of my pre-surgery overhead strength. I am not a physio (the guy in the following video
is, however) but I have read multiple physios talk about keeping the elbows IN during HSPUs to make it safer and stronger (so that your head and elbows would form a triangle or tripod position at the bottom of the rep). My understanding is that doing them with the elbows in activates your
scapular upward rotators (serratus, upper and
lower trapezius) and your external rotators (infraspinatus, teres minor, some delt) more.
Some people out there may disagree or have other opinions about the safety/efficacy of this motion, but this action supposedly creates a more stable shoulder joint because the external rotators are "sucking the ball of the humerus" into the shoulder socket. If your
upward rotators are all firing well, this keeps your scapula hugged against your ribcage better. All that also supposedly helps prevent impingement as well.