I teach all my pitchers from day one that they have a job. Their job is to produce outs in any form. Pop outs, ground balls, and yes, strikeouts. Every time you step on the rubber you go back to work. You do not think about the last pitch or the next pitch. You receive your pitching instructions, you step off the mound and visualize the outcome, you breathe, and you go to work. You repeat this job over and over again. There is no room for emotion when you repeat patterns. Routine eliminates time to think and dwell. It does not solve all situations and pitchers are human not machines. They are going to experience and show emotion during high pressure situations or poor outings, but for the most part, this helps eliminate the little peaks and valleys from happening.