I learned from Rowuk that he introduces articulation after the circle of breath is learned. My experience has been that when I am conscious of breathing I also become aware of a little “hitch” or seam between inhaling and exhaling unless I also articulate. The “how to” concept is a cheap version of the circle of breath, but the seam can be removed by a “hoh-oh” approach.
Tension is a huge enemy, and when playing our tongue can be a nasty culprit in breathing. The down and dirty Vulgano trick is to put a cardboard toilet paper roll in one's mouth and breathe in. Huge amounts of air rushes into our lungs. (A cleaner version would be a paper towel roll or a rolled up piece of paper.) I’m not a huge fan of dedicated breathing tubes made out of plastic and picked up at a hardware store—the idea is to learn and memorize the feeling. The tube forces the back of our tongue down, and once we get the hang of that we should be able to reproduce it at will.
The mechanics of breathing are pretty simple. The diaphragm drops, lowering the air pressure in our lungs, which then fill with air. Under the stress of performance, however, we can turn this into “work” and try to “suck” air into our lungs. This huge amount of tension involved effects our sound, endurance and has ruined many a performance.
Remember that bit about the mechanics of breathing? When the diaphragm drops and the airway is open, the air has no other choice than to rush into our lungs!
The air breathes us!
"In the case of archery, the hitter and the hit are no longer two opposing objects, but are one reality."