What the arm, hand, and wrist are doing from here to the
release point go a long way to either deceive or help
the batter.
Although the change-up, in my opinion, is the second best pitch in baseball - the first would be a good fastball, it can be a difficult pitch to learn for some players. There are many different grips that can be used and each one can be altered slightly to match the pitcher's comfort level and even the size of his hand. Sometimes it can be a lengthy process to figure out which combination works best. Early on in the process of learning a change-up, many pitchers make a common mistake. It is a mistake I see at every level even with veteran pitchers who have been throwing a change-up for a while. I call it flat-wristing.