 Variations can include touching the bar to the chest (sternum) versus the back of the neck, or varying hand spacing (wide versus narrow) or orientation (pronated versus supinated).The exercise can also be done using cable machines, a handle attached to a cable is pulled toward the body, this can be done while seated on a bench or stability ball, kneeling, or in a standing or squatting position.The number of repetitions and weight moved varies according to the specific training plan of the person training.