Someone here told me this, and I found the same exercise in my Claude Gordon Daily Trumpet Routines book. It goes like this: "exercise: There are 7 valve positions: 0 123 13 23 12 1 2 Start with the open(0) position and do lip slurs. Go as high and as low as you can and make sure your sound is soft and warm. Make the transitions from note to note smooth. After one minute, go to the next valve position(123) and do the same thing. If you "HONESTLY" do all 7 combinations (that would be around 7 minutes for all 7) every day and use the muscles I told you, you'll be a very happy camper by Christmas. Just remember this little saying, "7 in 7, 7 days a week" Just a note, this exercise will absolutey kick your butt. Your lip will feel like it ran a marathon. So remember, when you start getting tired, don't revert back to using mouthpiece pressure to change notes. As with any exercise of this nature, you're developing a muscle group. That's why it's important to pay close attention to what the muscles at the corners of the lips are doing. Feel what they are doing. In time, using the corner muscles will be second nature and you won't think about it as much. good luck" In the Claude Gordon book it's SLURS I noticed the 2nd or 3rd day doing it, MUCH harder than popping each note in with your tongue. I can say, this exercise is a GOOD one. I want to thank whoever it is who told me about it, pass it on, and say, when you do this, do it LEGATO not STACCATO and you'll get a workout.