I do something called the “Cat Yawn” where you mimic the exaggerated yawn that cats do. The idea is to get your soft palette to rise up as you open and close your mouth. I do ten sets of ten repetitions three or four times a day. It only takes a couple of minutes to complete.Another exercise I do is to sing the word “who” up and down a musical scale. I exaggerate the “O” shape that your mouth normally makes when you say the word. Again, the idea is to feel your soft palette rise up as you do the exercise.
Dave
