I've read that you should try to keep you shoulders behind the bar when you're setting up to do deads. I can do it when I'm doing conventional but not sumo. How important is shoulder position?
It's extreamly important because it keeps your back flat and not rounded.
Looks okay . I personally need to sit back more to deadlift comfortably.
But I've also only done sumo's a few times so maybe it is better to lean that far forwards.
This is what I've read...
The Dead Zone
The Top 10 Deadlifting Mistakes and How to Fix Them
by Dave Tate
Mistake #8: Not keeping your shoulders behind the bar
You've already read this a few times in this article and it's perhaps the most important thing next to hip position in the execution of the deadlift. Your shoulders must start and stay behind the barbell when you pull deadlifts! This will keep the barbell traveling in the right direction and keep your weight going backward. The deadlift isn't an Olympic lift and shouldn't be started like one.
I did a seminar with Dr. Mel Siff at one of his Supertraining camps (one of the best investments you can ever make!) and we showed the difference between the two positions. For the Olympic lifts you want the shoulders in front of the bar; for the deadlift you want them behind the bar. Period. The amount of misinformation out there about this is incredible.
If you keep your shoulders behind the bar, you're practially dragging the bar up your shins.... It's a lot easier keeping your shoulders behind the bar when doing conventional deads.