PhDre said exactly what I wanted to say. The shin vertical no knee forward thing comes from equipped powerlifting where it makes sense. It is stupid to apply it to raw lifting because you have no trampoline suit to sit back into.
Knee forward over toes is absolutely safe, if you train like that from bodyweight only and up. If you have never squatted like that and decide to put your regular training weights on your back and let your knees come forward, you will suffer.
Plenty of people squat with knees over toes: every weightlifter ever in history (look at knee position at the bottom of the clean and the snatch, high bar squat, front squat), most if not all raw powerlifters (the minority are the stupid ones that listen to Rippetoe), billions of people in the third word, all of our ancestors before chairs were invented.
The vertical shin, no knee forward thing is dumb if you really think about it. Again try my simple jump as high as possible (producing maximal vertical force) test. See how high you can jump from a squat position with vertical shins, with hip draaaave.
Knee forward over toes is absolutely safe, if you train like that from bodyweight only and up. If you have never squatted like that and decide to put your regular training weights on your back and let your knees come forward, you will suffer.
Plenty of people squat with knees over toes: every weightlifter ever in history (look at knee position at the bottom of the clean and the snatch, high bar squat, front squat), most if not all raw powerlifters (the minority are the stupid ones that listen to Rippetoe), billions of people in the third word, all of our ancestors before chairs were invented.
The vertical shin, no knee forward thing is dumb if you really think about it. Again try my simple jump as high as possible (producing maximal vertical force) test. See how high you can jump from a squat position with vertical shins, with hip draaaave.