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If it does not touch the wall, you have forward head posture, and it is likely that you suffer from weak neck muscles. Get into correct head posture by touching the back of your head to the wall. Pretend that there is a string going from the base of your neck to the top of your head.
Extending your arm backward is the job of your latisimus dorsi muscle of your back and your posterior deltoid. There is very little work being done by your upper body muscles in distance running so any building effect will be very slight. You use your upper body muscles far more in sprinting.