Triangle Warm Up Drill is the most used drill in beach volleyball. The drill works on two of the major skills, passing, setting and warming up players shoulders from hitting. The drill is also great for player spacing and communication. In this video Pedro Brazao takes the players through the drill and offers his own verbal cues and insights.
 
The drill is also great as it is very high rep and game like. There are several progressions you can add to the drill including having the hitters hit from outside.