There are zero humans deadlifting over 900 lbs without a rounded upper back.
Also, deadlifting can hurt you no matter how you do it. Injuries are part of the game, buddy. That being said, I do not believe his deadlifting style puts his lower back in any more peril than any other lifter’s does. KK has been one of the top deadlifters in the world for years, and as far as I know, he has never had a seriously debilitating injury. As others have said, his lower back remains braced throughout the lift.
Side note: beginners should not try to learn from watching the strongest men in the world. It doesn’t translate well at all.[/quote]
I agree. There’s always a risk even if someone is strong and has great technique. Not warming up enough, lack of focus, performing at the limit regardless of lifting style, etc. can all increase risk for injury. All we can do is accept the risk and try to reduce the chances but it can’t be eliminated.
Chris Duffin has sumo deadlifted 900 and kept his upper back straight but it was with straps and it wasn’t OVER 900 so I guess it doesn’t count, lol. I think it’s possible to see someone pull over 900 using sumo with flat back within our lifetime. They would probably be in the 220-242 weight class since it’s pretty rare to see much heavier guys pull sumo.
An over 900 pound (lol just barely) deadlift has already been hit sumo stance in the 220 class.