Shawn Patchell 10 high, 10 low volleyball defense warm up drill is a great drill to warm up your hitters shoulders plus work on defense and digging a low ball followed by digging a high ball with your hands. Shawn coaching philosophy is that skills need to be practiced in order to be improved and the skill of digging high is not something that is focused on enough during the usual course of practice. The result is that you need to practice it!
This post contains 2 videos, the drill being done plus the drill discussed in the office.
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I like the warm up drill but I try get the players away from passing a ball directly back in the direction it came from so I would consider making it a 3-person drill so we have an offset target to work the ball towards.