I'm sure it was my lousy description, but I don't feel anybody really caught onto what I was trying to discuss with the original posting. However, I'm a few days into two weeks leave, had plenty of time for focused practice, and some fairly significant things have happened which I hope will help explain.
What is body resistance? Still not sure, other than a feeling that it's taking too much effort to strike and hold a note.
What cures it? Probably a bunch of 'good' things done over a period of time, but I feel that the real breakthrough has been catalysed by working on clean double-tonguing for hour after hour after hour for months. In the last few weeks, this has concentrated on double-tongued scales.
Monday (or was it Tuesday?) morning started badly. I'd been out fishing over the weekend and I could hardly blow a note. Tried lip massage, and a dab of cocoa butter flavoured vaseline to try and get some buzz going. Played about 5 minutes an hour for the rest of the morning. Mid-afternoon, a load of stuff suddenly fell into place. Still there the next day but even better. And so on until today where I am, let us say a very happy bunny.
Good full core sound has jumped from mid-stave to top of stave.
Lung pressure needed for a given pitch has dropped significantly. The 'zero effort' zone has also moved to top of stave.
High C has become a strong note that doesn't threaten to burst a blood vessel.
Controlled double-tonguing speed has jumped from around semiquavers at 116 up to 132ish and now needs some effort to stop zipping off to 160+.
Comfortable double-tonging range has gone from an octave (D to D) to low A to top of stave G.
Regained a feeling of leaning into the resistance of the instrument (instead of against my own) and a much closer bonding with the instruments' resonance characteristics.
As I said in earlier postings, some of this has been floating in and out of my practice sessions for a good few months, but this week has felt like a real breakthrough in overcoming body resistance. Whatever it is. Yes. Happy bunny