As a 75 y/o comeback player now in my 6th yr of returning to playing, smooth slurs in certain intervals is still an occasional challenge -- eg., some open fingering like third space treble clef C to E and a some octaves. I realize strong embouchure and breath control are key, but recently I used an extra push from my diaphragm and it hit the upper note more cleanly and easily. Is that a technique to be used as necessary, or a bad habit? Is that considered "air support"? Or is just more embouchure strength and control the answer? Maybe all of the above? And of course it could be some tiredness and I should just rest more during practice. I'm also working on my AGR to find the best position for my embouchure, MP and instrument (Adams Custom E1, with Warburton 6 MP)).