#1, #2, and #3 skip the ball across the court
The defenders sprint on the air-time of the ball to closeout
Repeat several times
Closeout with proper technique
Communicate your closeout (i.e. "I got ball!")
Closeout with proper foot positioning (match feet) and pick-up points (red light, yellow light, green light, etc.)
Move on the air-time of the ball and be there on the catch