it's a deadlift. of course he's using a lot of back. have you seen PL'ers deadlift? check out benedikt magnusson or konstantin konstaninovs. ed coan used to say that when doing a sumo pull you don't need to keep your hips nearly as low as people claim.
it drives me NUTS to see pseudo-experts "correcting" high-level lifters. admit it. he's stronger than you and bigger than you and, surprise, he hasn't hurt his back because he's worked it to the point that the muscles there are his strongest.
What part of "on every exercise where he is not working his back" did you miss on my last post, so obviously I would not be talking about deadlifts...Jesus...Read before you type Brother...
Just bypass the whole bench and curl argument and tell me of course he is using his back when he deadlifts...Good debate...lol
1. I am not an expert and never said I was.
2. You do not know that he is stronger than me.
3. You do not know that he is bigger than me.
4. You have no idea if he has hurt his back or not, you are not an MD and not qualified to make that call.
and last but not least...
5. Speaking of driving you nuts, why don't you get off his nuts...
PEACE