I watched Kurt Thompson's video on Bud Brisbois' mouthpiece exercise. It consists of gripping the shank end of your mouthpiece and letting it hang like a pendulum. In the video he warns to not do the exercise too often and to never do it if you have a gig coming up (for obvious reasons). My question is this; does Roy Stevens' pencil exercise have those same dangers? I understand you shouldn't work your muscles to exhaustion with any exercise, but it seems like after doing either exercise my playing suffers instead of getting better. Am I just being too anxious and not giving my muscles enough time to recover?