2 runners start at the same time each with a ball.
While running they passes the ball to their rebound player by the sideline, breaks off and runs to the other side.
While running they receive the ball again.
The runners must time their passing to each other when they make a cross.
Then the balls are passed to the next rebound player and so on.
During the whole exercise the 3-step rule must be kept and dribbling is not allowed.