Impingement, which happens when tendons of the rotator
cuff muscles become inflamed or irritated when passing though the subacromial space, the passage under the acromion.
It wasn't until I tore both shoulders over time, and then
became a trainer, that I looked back on my career and noticed something I wish I'd known earlier: If you don't STABILIZE the shoulder joint by purposely training the four rotator
cuff muscles when doing heavy lifts with your big primary
muscles (Pectorals, deltoids, Traps, and lats), then you are leaving yourself vulnerable to potential injury as the years progress on.
Usually, when I get the other, larger
muscles firing properly and restored to their normal length, the rotator
cuff muscle (s) will not
become compromised and then allowed a chance to heal and function properly.