From http://asp.elitefts.com/qa/default.asp?qid=4102&tid=102 : This is one of the most popular max effort squat exercises at Westside Barbell Club. This exercise is performed in one way or another 70% of all max effort workouts. This is because it works the posterior chain like no other exercise. Done properly, this exercise will work everything between your traps to your calves. Begin this exercise by unracking a barbell the same as you would a squat. Set up so your feet so they are slightly wider than shoulder width. Get into a tight position (arched back, shoulder blades pulled together, knees slightly bent, abdominal pushed out against your belt). This is the starting position. Slowly bend forward at the waist until your torso is slightly above parallel with the floor, then reveres the movement to return to the starting position.