I highly recommend this three-CD audio program by Dennis Lewis for anyone interested in deepening her or his understanding of breathing and learning how to breathe in a more complete and natural way, which I believe is very important for our physical, emotional, and spiritual health and well-being. Though a lot of the material on these CDs can also be found in his book "The Tao of Natural Breathing," there is something wonderful about actually hearing this information in the author's own voice, which is both vibrant and deeply relaxing. I've taken several workshops with the author, and this audio production from Sounds True gives a helpful sense of his presence. What's more, there are some great practices and meditations that are not included in "The Tao of Natural Breathing."