Have the players get into three lines at half
court.

Player 2 passes the ball to the right to Player
3.

As he passes, he moves behind the player.

Player 3 passes ball to Player 1 as he moves
behind the player he passed to.

Player 1 passes the ball to Player 2 who sets
up for a jump shot.

As Player 2 shoots at the basket, Player 1
moves into position to box out Player 3.

After getting rebound, Player 1 passes ball
back to the middle line.

The players rotate counter clockwise to the
back of the next line.

The drill continues with Players 4, 5 & 6.

Drill can start by passing to the left but the line should rotate clockwise.

I like to give a consequence for not boxing out;
usually 3 laps.