Raise your left arm into the air. Great. Now check and see if the shoulder joint also went into the air. Did it? Now, put the arm and the shoulder back down and raising your arm without taking your shoulder with it. How? By thinking "pull the left shoulder blade down as I life my arm." Why? Because arm movement should happen mostly at the shoulder joint and not so much between the shoulder and the neck. For better long-term shoulder health (and less neck tension) maintain those finer motor skills (look Mom, I can move JUST my arm), which keep the smaller muscles in the shoulder joint more mobile and well-circulating and reduces the pull on the vertebrae of the neck. How'd you do? Try the right side too!