I don't know if you're still taking comments on this post, but I've done the exercise the past 6 days in a row. The first two days, I didn't notice any effects. The third day, I didn't notice anything when I did it, but I had much better energy level than usual in the afternoon. The 4th and 5th days, I got a strong, odd sensation, a sort of hollow lightness in my core (solar plexus through heart area), the kind of feeling I get after a good hard cry. It persisted for much of the day. Today, the 6th day, I got some of that sensation, but not as strong. I'm not sure what this means, or whether it's good or bad.

I also noticed that I shouldn't wait too long before exhaling, because if I do, I'm desperate for the next breath, so I will force the air out. I definitely think that gentle pressure when bent over and gentle exhaling are the better way to do this.

Unfortunately, it has not cleared my sinuses, because that's something I could use.