@bobcat51992 Re: squat.
I can see the swaying, but from the back it’s harder to diagnose. Can you post another from the side? I’d like to see where the bar is positioned on your shoulders — is it on your neck or traps? Your upper body wobbles a bit, so make sure you’re actively pulling the bar down into your traps. Your elbows should point to the floor.
I can’t tell if you’re bracing. Take a big breath in and push out all around, like you have a belt on that’s slightly too big but you want it to stay up. Then squeeze your abs like you’re replicating a cough or a HUH sound. That’s bracing.
For the sway, it’s very slight, but I recommend adding in unilateral glute work for your glute meds. Banded side steps, clamshells, split squats, etc.
Re: DL
Honestly it’s hard to tell with your shirt. Your back could be overarched or that could be what neutral feels like for you. Neutral is a range, not a singular ideal. I have a hyperflexible lower back with some inward curve — not enough to be problematic but enough that my DL set up looks like I might be overarching. The crucial piece of this for you will be how it feels.
So, try some things. First, get on all fours and do some cat/cows from yoga. Find the in between where you have fully left one and have not yet entered the other. That is your neutral spine. Remember how it feels. Then, when you set up for deadlift, soften your knees, bend at your hips, and just imagine you have very long Gumby arms down to the bar. Grab the bar. Shift back a little if you need to in order to pull yourself into the bar. I like to imagine that the bar is fixed to the ground and I’m trying to sit back but I need to hang onto the bar not to fall on my ass.
You should feel your hamstrings and glutes firing just to maintain this position as you build tension to pull the bar off the floor. If you don’t feel that, your lower back might be hyperextended. If so, try tucking your pelvis a little just to see. Make absolutely sure that your mid- and upper back is flat. Absolutely no rounding allowed.
It took me a bit to learn how to keep both tension in my glutes and hamstrings
and keep my mid-back elongated. But once I nailed that, I put like 25lbs on my DL in a single month.
Edit: You are hyperextending at lock out. This is very bad for your back. Just stand up. Emphasizing your glutes on set up should help with this.