The cue I used to use when squatting in the mirror was to look at my hairline and not into the eyes...tended to keep me upright more...I don't use mirrors any more....my mind is more focused on depth (hitting safety bars), chest lift, midback tension, proper foot width and spreading the floor, but keeping the head up is still key.
"...strength is built one recovery day at a time..." -OMP
"Do not change shit up during a training cycle." -Sandbox
Best PL total: 1020 - 350/265/405
Current total: 925 - 315/245/365