A Dimple is a pitch thrown by a pitcher in fastpitch

Fastpitch softball

Fast-pitch softball is a form of softball played commonly by women and men, though coed fast-pitch leagues also exist. The International Softball Federation is the international governing body of softball...

 softball

Softball

Softball is a bat-and-ball sport played between two teams of 10 to 14 players. It is a direct descendant of baseball although there are some key differences: softballs are larger than baseballs, and the pitches are thrown underhand rather than overhand...

. Upon release by the pitcher, the ball has backspin. The backspin on the ball combined with arm and leg lift causes the ball to rise as it moves towards the batter. Jennie Finch

Jennie Finch

Jennie Lynn Finch , who occasionally uses her husband's surname Daigle, is a former American softball player who pitched for the USA national softball team and the Chicago Bandits. Finch helped lead Team USA to the gold medal at the 2004 Summer Olympics and a silver medal at the 2008 Summer Olympics...

 is famous for striking out Major League Baseball

Major League Baseball

Major League Baseball is the highest level of professional baseball in the United States and Canada, consisting of teams that play in the National League and the American League...

 players with this pitch. The riseball is in effect upside down to a curve ball thrown overhand.

Some baseball

Baseball

Baseball is a bat-and-ball sport played between two teams of nine players each. The aim is to score runs by hitting a thrown ball with a bat and touching a series of four bases arranged at the corners of a ninety-foot diamond...

 pitchers throw a variation of the riseball known as a "backspin fastball

Fastball

The fastball is the most common type of pitch in baseball. Some "power pitchers," such as Nolan Ryan and Roger Clemens, have thrown it at speeds of 95–106 mph and up to 108.1 mph , relying purely on speed to prevent the ball from being hit...

." Over the 46 foot distance from the pitcher

Pitcher

In baseball, the pitcher is the player who throwsthe baseball from the pitcher's mound toward the catcher to begin each play, with the goal of retiring a batter, who attempts to either make contact with the pitched ball or draw a walk. In the numbering system used to record defensive plays, the...

 to the batter in Little League

Little League

Little League Baseball and Softball is a non-profit organization in South Williamsport, Pennsylvania, United States which organizes local youth baseball and softball leagues throughout the U.S...

 baseball, a baseball thrown horizontally at a speed of 50 miles per hour (80.5 km/h) would be expected to drop about 48 inches (121.9 cm). If sufficient backspin is put on the ball by the pitcher, the amount of drop over the same distance is reduced by about 12 inches (30.5 cm).

The movement of the ball is caused by the Magnus Effect

Magnus effect

The Magnus effect is the phenomenon whereby a spinning object flying in a fluid creates a whirlpool of fluid around itself, and experiences a force perpendicular to the line of motion...

.