This exercise should be performed with the use of a squat rack.
Before beginning the exercise, adjust the
barbell on the rack to a comfortable position.
Position yourself under the bar so that the
bar is resting on the back of your shoulders.
Maintaining proper postural alignment,
slowly lower your body (while sitting back) to a point at which your thighs are
parallel to the floor. (However, it is not necessary to go all the way to a
parallel position to benefit from this exersice.)
Slowly return to the starting position by
straightening your legs.
Repeat the exercise for the recommended
number of sets and repetitions.