The full squat is a perfectly natural position for the leg to occupy. That's why there is a joint in the middle of it, and why humans have been occupying this position, both unloaded and loaded, for millions of years. Much longer, in fact, than quasi-intellect ual morons have been telling us that it's 'bad' for the knees.
Mark RippetoeThere is simply no other exercise, and certainly no machine, that produces the level ofmuscular stimulation and growththan the correctly performed full squat.
Mark RippetoeExercise is not a thing we do to fix a problem - it is a thing we must do anyway, a thing without which there will always be problems
Mark Rippetoe