According to Rippetoe if it's a low bar squat it's OK to lean forward as long as your back is straight[1].
Of course as anything in fitness it's always up for debate.
[1]https://startingstrength.com/article/squat-mechanics-a-clari...
Of course as anything in fitness it's always up for debate.
[1]https://startingstrength.com/article/squat-mechanics-a-clari...
That is, rather than lifting the bar using the legs, lifting the bar by bending back. Of course, Rippletoe would never recommend doing this, and while leaning forward doesn't guarantee improper form, it can sure make it easier.
Leaning forward is okay while doing squats. A heavy weight causing you to lean forward out of your position is bad.