1 rebounds his shot and goes to the end of the line, 2 is the next shooter.
Groups of three players with two balls. The shooter gets open on the wing (e.g., v-cuts) for a pass, squares up on his permanent pivot foot and makes a scoring move, e.g., sweep baseline or crossover middle for a layup, rebounds his shot and goes to the passing line, the passer is the next shooter. Continue then switch sides.
(Options - one group on each side, more than three players in a group)