Have the players run, literally, in a circle in the key. Manager shoots and misses. All rebounders fight for the ball. (Not people you designate to get back on defense). Whichever team gets the ball heads down the court on offense. The teams play until a basket is made.
Teach the players to go strong after the board.
Make sure the defensive players communicate in matching up
Teach the offensive point guard to make a good decision.
It is great to sub in players during this drill. That will make it even harder on the defense to match up.
Rebounding, Defensive transition, Smart offense
This basketball drill is licensed under a Creative Commons License. This drill is from Pål Degerstrøm at www.degerstrom.com/basketball.