More than just Duck Walks …
Dmitry Klokov shows Overhead Duck Jumps.
I assume that just like Overhead Duck Walks, these are a great hip opener and also good for getting comfortable in the bottom position of the Snatch and build stability.
Update: He did 140 reps of those with 40kg in 23 minutes.
Update 02.05.2014: A variation with BTN Presses in between jumps.