Box out 2

Step 1:
Be aware of when the shot is taken.
Whoever is guarding the shooter should shout when the ball is released.
This allows teammates who can't see the shot time to react.

Step 2:
Pivot toward the basket immediately.

Step 3:
Put your body between the basket and the player you are guarding.
Bend your knees slightly and extend your arms away from your sides.

Step 4:
Keep your opponent away from the basket by maintaining body contact.
You want your opponent to be pinned behind you.

Step 5:
Jump for rebound.

(adapted from:http://www.ehow.com/how_8848_box-basketball.html)