The defender is not allowed inside any of the 4 areas and can only try to intercept the ball.
The players keeping possession can only pass the ball to empty areas, so therefore the players need to run out of their 'safe' box area to be able to receive the ball in that area.
Progression:
To make more movement, if a player leaves an areathey are not allowed to return to that area until having been in another area.
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