What’s A Rotator Cuff, And Why Does It Hate Me? By Dr. Phinit Phisitkul Ah, the rotator cuff—a fancy term for a group of muscles and tendons in your shoulder that, when angry, can make lifting your arm feel like you’re hoisting a grand piano. Dr. Phinit Phisitkul, who’s seen more sore shoulders than he can count, would explain that your rotator cuff is like the unsung hero of shoulder stability. But when it gets injured—thanks to things like overuse, heavy lifting, or your ill-advised attempt at becoming a pro tennis player—it lets you know in no uncertain terms that it’s not happy. How To Keep Your Rotator Cuff From…