To follow proper form, a pitcher releases the ball while keeping his wrist straight, then follows through fully. Additional change in velocity can be achieved by dragging the foot that would normally follow through fully with a fastball delivery. However, the most effective way to reduce the velocity of a changeup is by slightly reducing stride length. If the typical stride length for the pitcher's fastball is around 80-90% of pitcher's height, then the pitcher would need to reduce stride by 10-20%. By doing so, the pitcher eliminates the possibility of tipping off the pitch. Simply using a slower arm motion is undesirable, as it may tip off the batter, and will invariably result in less movement on the pitch. If this pitch is placed too high in the strike zone, it can be hit very hard. It is an effective pitch to throw early in the count to produce a groundball; it is not traditionally used to acquire a strikeout. By rotating the wrist (before the release) the pitcher can change the movement from resembling a fastball to resembling a curveball.