Here are some great articles on breathing exercises that might be helpful. There are a variety of different types of breathing exercises. There are different purposes for each different exercise. Here are a few reasons we do some of the breathing exercises...
Inhale for 4 counts through the nose. - Exhale for 6 counts through the nose.
(A reason why we breathe out through the nose is to warm up the body for our yoga practice)
Inhale for 4 counts through the nose. - Exhale for 4 counts out through the mouth.
(A reason why we exhale out through our nose is to release the heat in our body and allow a quick exhale.)
https://greatist.com/happiness/breathing-exercises-relax
http://www.webmd.com/balance/stress-management/tc/stress-management-breathing-exercises-topic-overview#1
https://www.mindbodygreen.com/0-4386/A-Simple-Breathing-Exercise-to-Calm-Your-Mind-Body.html
