A typical dunk needs a player to pass a nine-inch-diameter ball past a hoop ten feet in the air. To do so comfortably, they must raise the tip of their hand about 11 feet into the air. This is called a "tip-in." Not all dunks can be tipped-ins; sometimes players will go for more distance if the ball was at chest height or above when it hit the floor. The term "dunk" has become a generic term for any shot where there is significant forward movement after release of the ball. Such shots include free throws, putbacks, and three-pointers. The ability to make a dunk shows skill and strength in a player. Many players who cannot make a basket from beyond midcourt attempt dunking moves before throwing up a shot from near the free throw line. These are known as "half-dunks." In basketball, a layup is any shot taken with both feet directly under the body, with or without a dribble. A field goal is worth three points, while a dunk is worth two points. A slam-dunk is when a player goes straight up into the air and either lands on two feet or sinks his teeth into the ball first. Most slams occur during open court situations when there is no defender available to stop them.