Exercise Advice: Place a barbell under your chin, resting
it securely across the tops of your shoulders. Hold the barbell
in place with your hands with elbows elevated so that are parallel
to the floor. Your feet should be just beyond shoulder width apart.
Begin this exercise by squatting as though you are going to sit
down in a chair. Squat to a point to where your thighs become parallel
to the floor and then return to the start position. It is very important
that you keep your back as straight as possible throughout this
movement (one way to help do this is to focus your eyes on a spot
high on the wall in front of you throughout the entire exercise).