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Motion with a thrust of the upper block down is very important for beginners because they allow you to acquire muscle strength before the next execution of the various pull-ups on the bar.
The upper thrust block - This exercise increases the thickness of the back, accentuating the load on the middle part of the lat, involves the trapezius muscle, rhomboid muscles, biceps, shoulders and big pecs.Kinobody Shredding Program

Link upper unit - this is one of the best exercises for back muscles pumping. The muscles that are involved in the work: lats (middle part), diamond-shaped, trapezoidal, biceps, pectoralis major and shoulder muscles.
Due to exercise your back will get V-shaped. Most athletes use a wide grip, as in this case, the load increases significantly.http://health.reviewship.com/category/muscle-building/

Yet experts do not advise beginners to immediately start this exercise, because it increases the risk of injury of the shoulder rotator muscles and cervical vertebrae.
 The main burden falls on round here and latissimus and extends back. Indirect load goes back to the inner portion and the rear portion of the deltoid muscle. You can get injured if the cable simulator burst when working with a large weight. To avoid this, do the exercise correctly, pull the handle toward the trainer held high up in the chest, and not in the direction of his face.
Horizontal thrust in the block simulator – This exercise involves low lat, rhomboid muscles, and middle and bottom trapezoids. This basic exercise thickens and refines the lower back.