The closeout is a compromise between two mistakes

Two ways to be wrong

A defender recovering to a shooter has to cover ground quickly and then stop, and the two requirements pull in opposite directions. Arriving at full speed contests the shot effectively and leaves the defender unable to change direction if the attacker drives past him. Arriving slowly preserves the ability to defend the drive and gives the shooter a clean look he will take before the defender is close.

The technique that resolves this is not a compromise in speed but a change in the shape of the approach, sprinting early and decelerating late. That gives the defender most of the ground covered quickly and a controlled final few steps in which he can react.

Choppy steps and a low base

The final approach is made with short rapid steps rather than long strides, because short steps keep both feet available for a push-off. A long stride commits the body's weight to one foot, and a defender in that position cannot move laterally until the next contact. Lowering the hips during the approach serves the same purpose, since a defender standing upright must first drop before he can move sideways.

The hand goes up during this phase rather than at the end, because a hand raised late does not affect a shooter who has already released. Combining the raised hand with a low base is awkward and it is the specific physical skill the closeout requires.

Choosing a side

A closeout is rarely straight; the defender approaches at an angle designed to take away the option the attacker prefers. Closing out to the strong hand forces a drive in the weaker direction, which is a reasonable concession against most attackers. Closing out to the baseline side forces the drive towards the middle where help defenders are waiting, which suits some defensive systems.

The choice is a team decision rather than an individual one, since the help behind has to be positioned for whichever direction is being invited. A defender who closes out on the wrong side sends the attacker into an area where nobody is expecting him.

Closing out to a driver rather than a shooter

Not every attacker needs to be contested at the arc, and against a poor shooter the correct closeout is a much shorter one. Stopping short leaves the shot available and keeps the defender in position to contain the drive, which is the greater threat from that player. This requires the defender to know who he is guarding, and it is one of the clearest applications of scouting to an individual action.

Defenders who close out identically against every opponent are spending maximum effort on possessions that did not require it. They are also frequently beaten off the dribble by the attackers who were never going to shoot.

What happens after the contest

The closeout does not end when the shot is contested, since a shooter who declines the shot will immediately attack the recovering defender. The defender therefore has to reset his stance the moment the shot is declined, which means the closeout finishes in a defensive position rather than a lunge. Defenders who jump at a shot fake have committed everything and cannot recover, which is why the raised hand is preferred to a leap.

The same applies after a successful contest, because a missed shot creates a rebound that the closing defender is poorly positioned to secure. Boxing out from a closeout is difficult and it is where a large share of second-chance opportunities originate.