Quote from Gabfly1:
Sorry, I don't agree. The person who suggested the better way to do leg presses also showed me how to do squats properly. (I had been doing squats at the time. I have since stopped doing them about 5 years ago. I know they're a great exercise, but I prefer the relative safety of the leg press for going all out.)
Previously, I had been doing squats the way you described, with my back almost vertical. I also placed a 10-pound plate under each heel so I wouldn't fall backward, and my knees always protruded beyond my toes at the lowest point of the squat. I'm not to blame, because I had been following directions from a Weider manual from way back. But it is wrong.
The correct way, or at least the best way in my opinion, is to not use any plates to step on. And the only way to avoid the knees from protruding beyond the toes on the way down is to arch the back slightly forward to maintain balance. Your upper body actually has to lean forward a bit on the way down rather than remain vertical. When this approach was first suggested to me, I was put off and figured I would just humor the guy until he left me alone. But I tried it, and it immediately felt right. No more pressure at the knees. It was all quads and glutes. If I were to resume squats, it would be the only way I would do them.