[youtube=http://www.youtube.com/watch?v=mwNROJlbpI4&feature=youtu.be]
I have a bad habit of flexing my bicep on my under hand when I pull sumo. It typically takes a few weeks to get that out of my system when I go back to pulling sumo.
The simple fix: Flex your triceps when you pull.
Another way to think about it is to press your chest away from the bar (similar to 'long arms').
It's an argument that favors pulling hook grip, but my hands are too fat for that. Plus, if I'm not competing, who cares!
But focus on this cue in your warm ups IF you're having this issue.
