Just five moves can help strengthen and stabilize your shoulders. Here's what a personal trainer says you should be doing

Woman performs a rotator cuff drill.

It's important to keep your shoulders strong and supple with a wide range of exercises. 

The lynchpin of your shoulder is the rotator cuff, a group of muscles and tendons that hold the joint in its socket. You might have seen some claims batted about on the internet, saying that rotator cuff drills will "bulletproof your shoulders", making them stronger and less injury-prone.