The key is ot so much what you choose
to focus on but the equality of awareness that you bring
to each moment. It is very important that it be
non-judgmental, more of a silent witnessing, a
dispassionate observing, than a running commentary on
your inner experience.
Breathing relaxes you to a point where you can reconnect with your inner peace. Should you be distracted, breathe deeply and slowly; in through the nose, out through the mouth, tongue at the roof of the mouth. Intention is the key to everything you do in your meditation and life, it is a very powerful and creative Force.