I have to confess, I don't really like the word "mindfulness." I think it's misleading, and often misused. I believe it's a word that got lost in translation from East to West. The original intention of the word, if you read from some of the buddhist teachers like Tich Nhat Hanh, was to capture a state of being that is fully present and awake, relaxed and alert. The word Mind in eastern teachings most often refers to a place of inner being, inner knowing.
...where we had thought to travel outward, we shall come to the center of our own existence; where we had thought to be alone, we shall be with all the world.”