You don't get big and strong from lifting weights - you get big and strong from recovering from lifting weights
Mark RippetoeA squat cannot be performed on a Smith machine any more than it can be performed in a small closet with a hamster.
Mark RippetoeThe hang clean is unweighted and is of little use to watch, except that it shows a problem known as a Donkey Kick. As the jump occurs, the heels come up in the back and then stomp back down into place. This is a terrible waste of time and energy, and contributes nothing to making the bar go up. Stop doing this immediately or I will have you killed.
Mark RippetoeThere is simply no other exercise, and certainly no machine, that produces the level of central nervous system activity, improved balance and coordination, skeletal loading and bone density enhancement, muscular stimulation and growth, connective tissue stress and strength, psychological demand and toughness, and overall systemic conditioning than the correctly performed full squat.
Mark Rippetoe