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With a barbell on your back as if you were performing a squat, start with one foot on top of a box (20-24 in.) and the down foot up against the box on the floor. Push through the box with your heel and do not let your heel come off the box. Do not push off with your down foot. As you perform the step-up, maintain a tight back and squeeze your abs. Maintain a 45-degree torso angle. As your body rises on the box, lift your down leg through and finish with your thigh parallel to the ground with both your knee and toe up.