Magic!
Don't know how or why this works, but I suffer from tension in the neck and shoulders.  15 minutes on this thing and it releases the tension.  I suppose you can use it on different surfaces, but I like to lie down on the floor and let my head rest in it.  You can feel your neck stretch.  After about 15 minutes or so, I feel relief.  It's certainly worth a try!
Rating: 5 stars