I found this drill on FastModel Sports Basketball Plays and Drills Library.
They have several pages with drills and plays posted by high school and college coaches.
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This is a way to get some variety in your drills as you work on 5/0 offense and on your transition game.
This 5-3-2-1 Push-Push Drill from Gary Colson can be used to practice running your fast break after a made basket.
Run offense against no defense.
When offense scores 5 takes it and passes it to 1 going down the sideline.
Run your secondary break into a 5 on 3 situation.
5-on-3 until they score or the defense gets the ball on a steal or rebound.
They will attack 3 on 2 which will be our 1 and 2 who transitioned back on defense.
3-on-2 and whoever shoots first is back on defense vs 1 and 2.
We finish the (5-3-2-1) with 2-on-1.
The next 5 set up at the other end to start 5-on-0 and continue the drill