Begin with one offensive and one defensive player in middle of court (represented by 2 on offense and x3 on defense in the diagram). Surround those two players with three other players (1, 5 & 4 in the diagram).

The surrounding players are trying to make a pass into the offensive player (#2). The offensive player must try to seal the defender and create a passing lane. The pass must be a direct chest pass. It can not be a lob or a bounce pass. The surrounding players can pass to #2 or one another.

If the defensive player steals the ball, he changes to offense. Each successful pass counts as one point. Keep score and play to a set number of points before rotating in new players.

https://www.breakthroughbasketball.com/play.asp?id=1449&utm_source=Newsletter&utm_medium=email&utm_campaign=NewsPositionSealing112015Oth

Get a good position in the low post
Fight for your position

Watch the players (instead of the ball) so you make quicker decisions after receving the pass.
Require communication (call out skip pass, etc)
Use 4 passers
Use 4 passers and 2 players sealing