I recently stumbled across some exercise breathing techniques taught by the Postural Restoration Institute. I'll generalize here based on what I've seen so far, but there might be some exceptions along with some subtle points I'm missing as their stuff is relatively new to me.
When trying to reset the hips to their proper orientation and reduce rib flare using "their" exercises, they typically recommend exhaling all your air out through your mouth to the extent that you can't even hum or make any sound with your breath and hold that position for 4 to 5 seconds, then breath in through your nose, but not too fast, so you can't hear the air coming in. In an effort to keep it simple I won't get into where the air should be going on the inhale and things like that when performing their exercises.
In my experience that kind of exhale really helps to tighten the abdominals substantially and get the ribs out the way.
1. So when performing Coach Sommers' Foundation exercises how strong is our exhale supposed to be, do we ever want to hold the exhale position and how fast should the inhale be?
2. Do we start the exhale at the beginning of a concentric movement and the inhale at the beginning of an eccentric movement?
3. How should we regulate our breathing during static holds?
I'm not sure if doing what comes naturally will be optimal for everyone; hence the reason I feel the need for clarification on the subject.