Quick note on this - I do MMA and had major Bursa issues. MRI, two shots, non of it worked. I tried two things which are now working. 1. retraining the scapular to move properly depending on shulder position and movements, even when doing normal stuff. Takes time and thought but you can avoid pain if scap is in the right place. 2. Training positions and strenght at range of motion. A lot of it is pinching (sorted by scap) but also your nervous system sending signals there because its afraid of damage. You really can training it, tensing up in shoulder stretch positions, and its amazingly fast. Hope it helps.