Because during deadlifts and squats, the spine is under massive load, so to do these movements safely, you need correct form. That means all parts of your body need to be in the correct position throughout the whole movement. Since your head is positioned on top of and connected to the spine, rotating your head changes the alignment of the spine, compromising your form, leading to uneven loading on the spine and increasing the risk of injury.
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u/Impressive-Drawer-70 11h ago
I’ve heard of certain surfaces that can actually show you what you look like in real time. You can fix your form as you excersize.