Recorded June 2013 at TedGlobal 2013: 15 minutes in length
This talk is about the importance of breathing and prescribes breathing practice that is rhythmic, smooth and focused on the heart.
The short video above was provided by the American Psychological Association; others are available at the APAHelpCenter YouTube Channel.
Recorded July 2011; length is approximately 8 minutes
Sources for more - short - videos include Stressfree.org, a website developed by a professor of medicine at the Mayo Clinic