There is simply no other exercise, and certainly no machine, that produces the level ofmuscular stimulation and growththan the correctly performed full squat.
Mark RippetoeStrength is an excellent example of a physical characteristic that drives improvement in other athletic parameters. More strength means more power, more endurance, better coordination, and better everything else. This is why, all other things being equal, the stronger athlete is the better athlete.
Mark RippetoeThe 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 Rippetoe