Mindfulness of Body
Traditionally, in the meditation instructions handed down from the Buddha, attention to breathing is understood as part of the overall practice of mindfulness of body. Sit here and feel the body breathing in (however short or long the breath, let it be that way) and breathing out (don't try to make the breath deeper or longer, just let it be however it is).
Gaylon Ferguson, Natural Wakefulness (Shambhala Publications)