You're out for a walk when you notice it. Pop. Maybe it's a click, a snap, or a subtle sensation deep in the front or side of your hip. Sometimes you can hear it. Other times, you can only feel it. For some people, it happens every few steps. For others, it only occurs after sitting for a while or during the first few minutes of a walk. If you've ever asked yourself, "Why does my hip pop when I walk?", you're certainly not alone. It's a common experience, and while it can be surprising, it...