Stiffness can sneak up quietly. One day it takes a little longer to get out of a chair. Reaching the top shelf feels harder. Turning to look behind you in the car takes your whole body instead of just your neck and shoulders. The good news is that flexibility is trainable at any age. You don’t need to fold yourself into a pretzel, buy fancy gear, or spend an hour stretching every morning. A few gentle, consistent movements can help your joints feel less cranky and make everyd