The NBA s reasonable collision zone is set because of whom

In the NBA, the center of the basket is the center of the basket, and the semicircle with a radius of 4 feet (meters) is called the reasonable collision zone. Standing within the arc, a defensive foul may be awarded as long as the defender makes physical contact with the offensive player. In addition, the defender can stand up in advance, and if the offensive player touches the defender with his body, the offensive player will be sentenced to hit someone.

In a reasonable collision zone, when the opponent is attacking, a defender will not be whistled for a foul if he jumps vertically, but a defensive foul will be whistled if he does not jump or jumps after moving his body to make physical contact.

The ball carrier must anticipate the opposing defense, and whenever a defender appears in front of him and occupies a reasonable defensive position, he must control his body at all times or stop immediately. Either immediately change the direction of movement to avoid physical contact with defenders. Otherwise, in the event of a town and physical contact that causes an offensive foul, the player with the ball will be responsible.

Defenders must occupy a lawful defensive position. This legal defensive position is defined as: (emphasis) when the defender faces the opponent.

The feet should land on the ground in a normal straddle position, and the distance between the feet should generally be the same width as your shoulders or slightly wider than your shoulders.

Rational use of the body in ball control and pressing. For example, when the defender and the striker accelerate to catch up with the ball at the same time, the bodies of both sides will definitely squeeze together and collide, and there will always be some instinctive movements in the hands, which is reasonable body contact. Another example is to use the body to lean on the opponent when grabbing a header, so that the opponent can't grab the point or even can't jump, this is not a foul, and it is considered reasonable physical contact.

But these are all about using the body with equal opportunities for both sides. If the opponent has already jumped and rushes the opponent with his body to lose the opponent's center of gravity, or knocks the opponent away when the opponent is already in possession of the ball, it is a foul. A player who tries to block an opposing player from touching the ball while covering the ball is not a foul within the meaning of Rule 12(3) because the ball is within the player's control and he may cover the ball as tactically necessary.

In this case, the opposing player can make a reasonable collision.

This is to prevent tall players from standing under the basket when defending, and when the opponent breaks through to the basket, the opposing center will inevitably be hit by the layup player, and international rules (such as the rules of the World Championships and the Olympic Games) say that as long as the defending side does not leave its own cylinder, the attacking team will be sentenced to hit someone. As a result, as long as there is always a defender standing under the basket on the inside, it is difficult for the offensive player to make a beautiful layup or dunk.

In the original basketball rules, there was no reasonable collision zone, but in order to encourage offense, especially the offense of outside players, and increase the spectacle of the game, the NBA added a reasonable collision zone.

It seems to be because of O'Neill.

The small circle under the basket is called the Reasonable Collision Zone, where the defender stands in the area and the offensive player bumps into him and is not enough for an offensive foul.

It's not just the NBA that has a reasonable collision zone, all basketball courts have it, which is the free throw line, and it's close to the basket inside, and the one with the dotted line is a reasonable collision zone, and you don't usually squeeze people in.

The so-called reasonable collision is that.

There's nothing else to do, but if you break through with the ball and someone else comes to stop you and you fall, then he stops it.

The problem of blocking and ramming is like a car coming and you hit him in the middle of the road and you go to stop him and hit him, depending on who stands first.

The "no-charge area" = the "no-charge area" was introduced at the beginning of the 1997-98 season.

In the 1966-67 season, the league stipulated that interior players could not "stand" in the three-second zone for more than three seconds;

In the 1981-82 season, after Stern entered the NBA, the star-making movement began, stipulating that no ball-free people could be included, and the interior could be stationed in the three-second zone...

In the 1997-98 season, the league introduced a reasonable collision zone, where physical contact was not fouled (from then on, everyone saw O'Neal squeezing the opponent's dunk...

In the 2001-02 season, the league eliminated illegal defense (making the NBA go back to the pre-80s rules, when Russell, Chamberlain and other centers played, and allowed centers to be caught off the ball), and at the same time stipulated that interior players could not "stand" in the three-second zone for more than three seconds without anyone attacking the interior (this is the same as the rules established in the 1966-67 season), which is the so-called problem of dotted and solid lines.