From under the basket, 1 passes to 2, starts to run in a small circle, gets a return pass, passes to 3, gets a return pass, passes to 4, and gets a pass for layup.
Players rotate counter-clockwise, 4 rebounds and is the next shooter. Continue, switch directions. Groups can compete with each other (first team to finish, but a player has to go again on a missed layup).
(Variation - use two balls with more players)