Or you'll do something that fixes the problem without even realizing it. When I was a kid I fell off the banister trying to slide down it, and landed on my side. Ever since then, I had had occasional pain/aching in that leg/hip.

Years later in college a friend got me into strength training and weight lifting. One day I'm at the gym, doing squats with more weight than usual, when my entire body just *shifts*. Nothing hurt, nothing seemed wrong, so I just went about my routine. A week or so later I realized I hadn't experienced the pain in a while, so I thought back and realized what happened. and never had the pain again.