Notice at any time and during any activity how your mind is disposed, where it wanders, how it apprehends sensory objects; then encourage a composed and calm awareness of the breath as you continue to do your work or engage in the activity. During daily activities, it is not possible to exclusively focus on the breath, yet, whether you are walking, working, talking, or eating, you can use your interest in the breath to encourage a balanced state of calm composure."
Shaila Catherine "Wisdom Wide and Deep. A Practical Handbook for Mastering Jhana and Vipassana." Wisdom, Boston, 2011.