M1 throws the ball to A, who dribbles against the opposite goal and performs a jump shot at the goal circle.
M2 tries to block the shot. At the same time B starts.
A gets the ball and place it at the side of M2's goal and runs behind B's line.
M2 quickly gets a ball and throws it to B, who dribbles against the goal circle and so on.....
The exercise can be performed while running on the opposite side.