Players can use either foot as the center foot when catching the ball with both feet on the ground. The moment one foot is lifted, the other foot becomes the center foot. To judge the foul with the ball, we must first establish the central foot. Only by accurately establishing the central foot can we correctly judge the foul with the ball.

When a player catches the ball while moving or dribbling, he can stop and determine the center foot according to the following conditions:

If one foot touches the ground and two feet touch the ground successively, the first foot that touches the ground is the center foot; When a player touches the ground with one foot, he can take off with that foot and touch the ground with both feet at the same time, so neither foot is the center foot.

Basketball is the core event of the Olympic Games, and it is a hand-centered physical antagonistic sport. The standard basketball court should be a rectangle of 28m× 15m. The measurement of the site starts from the inner edge of the boundary, and the measurement of all areas, lines and circles in the site starts from the outer edge of the boundary, and the line width of each line in the site is 5cm.

In a basketball game, there are usually two defenders, namely the shooting guard and the shooting guard. The former's task is mainly to organize the defense of the whole team, control basketball, and have the right people to control the overall situation and organize the attack at the right time. The shooting guard is mainly responsible for scoring goals, but also to understand the opponent's attack and organize the opponent to score goals.

The point guard refers to a fixed position in the basketball team. The point guard is the attack organizer of the whole team, and then decides the right time to pass the ball to the right player by controlling the ball.