To change from the set position to the wind-up position, what must a pitcher do first?

The correct procedure for a pitcher transitioning from the set position to the wind-up position begins with lifting the pivot foot. This action is essential as it signals the pitcher’s intention to deliver the ball in a traditional wind-up manner. By lifting the pivot foot and taking a step backward, the pitcher initiates the mechanics necessary to generate momentum and prepare for the pitch.

In the wind-up position, the pitcher has a bit more freedom in their delivery as opposed to the set position. The shift from the set position to the wind-up not only allows for a different rhythm but also provides the pitcher with the ability to engage the batter with a more dynamic motion.

Other options like throwing the ball to the catcher, alerting the umpire of the change, or making eye contact with the batter are not required steps in this transition. The process is primarily focused on the physical mechanics of the pitcher's stance and movement, making the first step critical for a proper and legal transition from one position to the other.