From high school through college baseball my approach on deck, and in the dugout in general, are to pick up release points on the different pitches. It took me quite a bit longer to realize how this helps in high school but if you can realize that this is a great game but also that you can often "out smart" the other team/player to gain an advantage you are a step ahead of others.
My coach in high school gave us a speech on how we finally "got it" when we began picking up these cues.
So look for release points and how they are giving away the pitch being thrown. Always try to visualize what you want to see, look fastball and adjust. Going the opposite way, and having the ability to do it well, will boost your batting average quickly and (like CoachTraub's quote say's) it will often allow you to do the job you know you have to do in many cases!
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