Olympic Squat

How to do it

Begin with a barbell supported on top of the traps. The chest should be up, and the head facing forward. Adopt a hip width stance with the feet turned out as needed.
Descend by flexing the knees, refraining from moving the hips back as much as possible. This requires that the knees travel forward; ensure that they stay aligned with the feet. The goal is to keep the torso as upright as possible. Continue all the way down, keeping the weight on the front of the heel.
At the moment the upper legs contact the lower, reverse the motion, driving the weight upward.

What muscles does the Olympic Squat work?: Mainly the quads, with help from the calves, glutes, hamstrings.
What equipment do I need?: Barbell.
Is it good for beginners?: It is rated intermediate level.
How do I track progress on it?: Log each set and beat the weight or reps from last time. Liftrung shows your last set beside the next one and estimates your one-rep max from your sets.

Exercise descriptions: free-exercise-db, public domain.