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Psychic alternate nostril breathing
Once you have become really comfortable with alternate nostril breathing, you can start to practice psychic alternate nostril breathing. This is where you breathe normally but imagine you are breathing in through the left nostril and out through the right, back in through the right and out through the left. So when you breathe in you focus on your left nostril, then breathe out and focus on your right nostril and so on.
Alter practicing regularly you may find that you can actually control the breath moving in the nostrils without using your hands — breathing in and out through alternate nostrils. If you focus your attention behind the nose above the upper palate you can find the switch that controls this (it is a subtle muscular contraction).