The area is limited by a couple of cones. The ball is passed between the 3 backcourt players. The 2 "CR" on the attacking team must not cross the center, however are allowed to move freely along the goal circle line.
LB makes a piston movement against the defending R2 who moves against the attacker to check.
The nearest R3 covers first CR.
The other L2 covers the second CR and the second defending L2 is ready to cover the second attacking RB.
The ball is passed to CB, who makes a piston movement.
First defending R2 falls back and covers CR on her defending side and defending R3 in the same side moves out to check.
The second defending L3 covers the second CR.
The ball is passed to the second RB, who makes a piston movement against the defense.
The defending L2 moves out to check and the nearest defending center L3 falls back to cover the CR.
Then the exercise is played again reversed.