HOW TO PRACTICE BREATHING MEDITATION:

Sit in a comfortable position on the floor or in a chair. Sit upright, with your back straight (but not uncomfortably so).
Gently bring your attention to your breath. There's no need to change how you are breathing in any way, but just notice each breath as you inhale and exhale.
Be aware of the sensations in your body as you breathe; observe what parts of your body move as you breathe.
If other thoughts come in to your mind as you practice, acknowledge them and then gently shift your awareness back to your breathing again.
Continue for 2 to 3 minutes or more, as you like.
Mindfulness of breathing meditation dates all the way back to the Buddha himself, who was born in the sixth century B.C.E.