When throwing the ball, the pitcher must touch the pitchers mound with his foot. The pitcher's rubber is on top of the mound. The pitcher cannot take more than one step forward when he throws the ball. That makes the pitcher throw the ball slower. Many major-league pitchers can throw the ball up to 100 miles per hour (145 km/h). Throwing a baseball that fast can be bad for the body. Pitchers can end up with a lot of injuries. Doctors often will perform Tommy John surgery on a pitcher with an elbow injury. The operation is named after Tommy John, the first pitcher to have the surgery. Today, pitchers are able to recover from their injuries much more often than before Tommy John surgery.