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Originally Posted by
Jason Donaldson
I agree that, especially the further you go into the set, the more your hips are rising faster than your chest, but I'll say that's not a bug, but a feature.
The reason your body is doing this is that, as it gets heavier for you (including that you're fatigued...), the more you have to involve the strongest musculature.
In other words, despite the bar placement, you're sliding into low bar mechanics because those mechanics are better able to move the weight, i.e. they're stronger. I know you don't want this thread to center on your choice of high bar, but that's why that's happening.
I will also say that, whatever squat style you choose, it would behoove you to use an eye gaze that will maintain an anatomically neutral position for your neck. Craning the neck up under load to keep looking at the mirror or the wall puts you at risk of cervical issues, something no one wants, but a grappler especially doesn't want.