This quick and simple exercise relieves your neck and shoulder stiffness. Here are the steps:
Lift your shoulders.
Hold your shoulders in the up position for few seconds (5 seconds)
lower your shoulders.
You may want to repeat these steps several times. I personally perform this exercise about a dozen times during the day. I feel its effects immediately in the form of warming sensation in the neck and the shoulder muscles. Sometimes I perform a variation of this exercise in which I do not only lift my shoulders up, but I also move them in a circular motion. It feels good.
Enjoy and be healthy!