Mindfulness is awareness of one’s thoughts, actions or motivations.

mindfulness wikipedia.org

Thich Nhat Hanh, Plum Village plumvillage.org

Reference:
The shown clip is from the DVD accompanying the book:
Walking Meditation (sep 2006) Thich Nhat Hanh, Anh-Huong Nguyen
ISBN 1591794730
The Miracle of Mindfulness: A Manual on Meditation (dec 1999) Thich Nhat Hanh
ISBN 9780807012390
The Blooming of a Lotus: Guided Meditation for Achieving the Miracle of Mindfulness (jun 1999) Thich Nhat Hanh
ISBN 0807012378