A squat cannot be performed on a Smith machine any more than it can be performed in a small closet with a hamster.
Mark RippetoeHistory tells us what works in the gym, and everything else walks down the road with a carrot in its ass.
Mark RippetoeIf a program of physical activity isn't designed to get you stronger or faster or better conditioned by producing a specific stress to which a specific desirable adaptation can occur, you don't get to call it training. It's just exercise.
Mark Rippetoe