You start at the baseline and make 3 lines one in the middle and one on each side.
the ball starts with the middle person they pass it to either side, after you pass it follow your pass by running behind the person you passed in to, continue up and down the court.
Example __1___2___3__ (Baseline lines one two and three)
2 passes it to 3.
2 runs behind and then forward.
while 3 passes it to 1, 2 is running to get the pass from 1 then 1 will run behind 2 while 2 passes it to 3. etc…