Yesterday, I had a one-on-one session ("Functional Integration") with a local Feldenkrais teacher. It was quite an experience. At the beginning of the lesson, he had me run across the parking lot to check my running form. He noticed a number of things right away, such as my right elbow swinging back normally but not my left elbow.
Inside on the table, he quickly found that I was out of alignment. My left side was directly supporting force, while my right side tended to collapse and shift to the left. The reason (we think): I injured my right knee back in high school. It wasn't a big injury or anything, but it looks like my body has been compensating for it by shifting weight and force to the left side.
After this, he did some bodywork to try and even things out. By the end of the session, I could feel my right side now supporting force. There is still some work to do, but I am impressed by the changes in just one session.
Now for the topper: near the end of the session, he held my head in place. It immediately felt correct but not what I was used to. I asked, "was my head out of alignment?" He said that yes, it was slightly off-center! Looking in the mirror afterwards, my head and neck alignment did look significantly straighter.
One other odd thing: after putting me into proper alignment, both he (and later someone else) noticed my voice was slightly deeper! Strange, but true. I guess misalignment can affect voice production.
Needless to say, I was very impressed with the whole experience. I felt I received significant value for my time and money. How all this will affect my running, I'm not sure, but it seems like it can only help. I will be going back next week for another session.