A power shrug is essentially the middle motion of a power clean. It is intended to be a power move for the traps. You start out with the bar resting on your thighs (the weight should be heavy) and then power shrug your shoulders. You use some momentum from your legs to help you get the weight moving up, you arms remain straight, you don't clean the weight up to your shoulders. I'm not sure I explained that very well...
It's a move that I started using when the ol DB shrugs lost their shine and I could tell a difference in a couple of months, now I cycle them in once a year for three or four months.
Anyway, I mentioned them because Davie asked about resting the weight on the upper thighs. Oh, if you're pulling 535 for stiff legged deads, you're pretty dang strong. Congrats.
BTW, I'm from Round Rock, just north of Austin.
Regards,
Parker Boy