A lot of You People need to understand how much bad information about lifting comes from Bodybuilding. Not every bodybuilder, but a lot. Here is one great example. Clip 1: Bodybuilding legend Robby Robinson explains how to avoid injury in the deadlift, you need to bend your arms. Yes, you heard that correctly. The literal exact opposite of the truth, the exact mechanism which greatly increases the likelihood of tearing a biceps tendon in the deadlift (which ~never happens for people who do a controlled pull with straight arms) is what Robinson claims you MUST do to avoid injury.
This isn't just a small disagreement. This is comically absurd levels of delusion. If it came from some random gym bro that would be one thing, but the important lesson here is that you can ascend to the highest levels of bodybuilding success and fame without knowing the most basic things about training that us mere mortals who have normal genetics and aren't blasting gear HAVE TO LEARN or else we won't succeed.
Bent arms facilitating biceps tendon tears is easily understandable via mechanisms: The deadlift is a heavy lift that, if done at a weight heavy enough to spur adaptive stimulus, must be with much more weight than you can curl, then it will tend to forcibly straighten out the arms under load as you lift, which increases the chances of a rupture. But as a real lift demonstration of this phenomenon, I offer you Clip 2 which shows this happening in action: A lifter tearing a biceps tendon on a deadlift which you can literally see happening because of the bent-arm pull. I've never seen this happen in less than the 550-600 range EXCEPT in cases of bent arm pulls exactly like this one.
If Robinson hadn't said what he said but I claimed bodybuilders say this, I would be accused of making up things to hate on bodybuilding. But this is just one example of a pattern I've observed over 25 years doing this. I have taught the deadlift to IFBB pros who have stood on the Olympic stage, who told me after the session that they had no idea how to do them until working with me, they just winged it and sort of copied what they saw other people do.
If you want to learn how to achieve a bodybuilding look, most bodybuilders know a lot. If you want to understand proper technique for complex lifts and loaded human movement patterns, the bodybuilders who know and understand that are the exception, not the rule.
One of the more common errors you see in the deadlift is people trying to "pull" with their back while "muscling with the arms"
Get a proper grip in place, let the arms hang like long chains, set your back hard and push like hell