Yawn = Killer Tone, Prevents Breathing Issues & Unintended Bending

After giving a five-minute long lecture to students on mouth, jaw, tongue, soft pallet and throat positioning, I finish by saying, "basically yawn, this puts everything in a good position." An embouchure that's in a yawn-like state drops the jaw and pushes it slightly forward, lowers the tongue, raises the soft pallet (to close off the nasal cavity) and opens the throat. This all leads to killer tone on the harmonica and prevents breathing and unintended bending issues.