Usually when a student is asked to make the “M” position correctly they end up with a lot of excess tension, located primarily in the upper chest, throat and embouchure center. If the player can successful play a note this way it is often clear and high, with a lot less effort than they might expect (which can be very encouraging and exciting), yet it may now be the middle and lower registers that are difficult, if not impossible to play. The reason for this is excess tension, which at first may be hard wired in their minds as a part of the new embouchure.
I am always telling students to take more time to set up, and those who do so are rewarded with much better results. However if even more time is taken to remove that unneeded tension the results can be even more impressive. One of the best ways to eliminate the tension and develop the image and strength for the new embouchure is to hold the position for an extended length of time. This is very similar to holding a yoga posture, which requires strength and oftentimes balance, but in turn develops flexibility and a focused mind. I chose 30 minutes almost arbitrarily, but after more thought could see that number was realistic and had its advantages.
Well before the 30 minute time frame fatigue will begin to build, making it much easier to identify and locate the source of that fatigue and know that is also the location of the tension. At that time the body will also be very motivated to relax, and if the muscles are not required to hold the position (and most of those that are tense are not) then they should be allowed to release. The remaining muscles involved with holding the position should then be much easier to identify, and their job should also be easier since their opposing muscles are most likely the ones that were carrying the excess tension. The 30 minute time frame allows for this process to unfold, for conditioning of the proper muscles, and the experience of “living” in that space. Awareness is also increased, which will also help any needed modifications in the future.
Jon (an adult student who plays in some of his own jazz groups) was my last student to take up the 30 minute challenge. The next day when he came to his lesson I could tell something big had happened, for not only was the embouchure set better, Jon was also more relaxed and focused, and his posture and horn angle were more than noticeably improved. His airstream was relaxed and free flowing, and the embouchure seemed very calm as he blew. Months of improvement happened overnight, and the positive changes have remained in place ever since. Very impressive, Jon!