In the span of two days, a petite 65 year old woman and a 285 pound college lineman had come to our office seeking relief from back pain. Once we evaluated them, it turned out that their issues were both pretty similar, and could both be resolved quickly. The woman had actually been to quite a few providers for relief of her pain, but there was no obvious reason they found as to why she was hurting. That is, until we were able to watch her walk.
Think about it; most of us walk miles a day. It makes perfect sense that if there is even a little bit of imbalance in our biomechanics, the assymetry shifts demand on our spine and some of our muscles, which can lead to cummulative injury (taking thousands of steps per day) or acute injury.