First, the practice should be full of adversity. We attempt to put so much game like pressure on them that the games themselves are easy. For example, we do a "multiple infield" drill where there are 3 balls being fielded at once and they all have to listen and respond on what the calls are for them for their particular situation. Everyone is running around and they all feel the pressure because one bad play ruins all of the other residual plays. During a game, it is a different story. You have to know the kid. One thing I like to do is ask for Johnny to come to my office. (Usually somewhere where no one can see us.) As I've posted a million times, I start these conversations off with, "Well, what do you think?" You'd be amazed at what they will say. Respond from there. Pat em on the back, kick em in the butt. Then pat them on the back again. Think back to when you played. Sometimes that one thing that "Coach" said to you just made you have to play better. The trick is to be the coach that can do this. JMHO!