The purpose of this exercise is to train the backcourt player's pressure between the defending No. 1 and No. 2 and force both to cover the attacking backcourt player.
By this the wing will be free to a shot.
When the exercise starts, the wing has the ball.
The ball is thrown to the running in backcourt player, who receives it, makes an initial feint and presses outward.
The ball is then thrown/bounced to the wing, who receives it while running forward to a shot.
But instead of shooting the ball is thrown to the next running in backcourt player, who makes an initial feint and passes to the next wing.
The wing runs to the backcourt position after the pass and the backcourt player runs to the wing position.
The exercise can be made more passing realistic if the wing passes to a center backcourt player, who again passes to the left/right backcourt player.