If your gym has a seated cable row station it is well worth utilising as part of your back training. The primary target of the cable row is the latissimus dorsi (often referred to as the "lats"), the largest muscle of the back. Other upper back muscles such as the rhomboids and teres major also play a role in the cable row, as do the biceps as they flex the arm.
Athletes who find the bent over row difficult to master, or who have posture issues, may find the cable row a much welcomed alternative. It is much easier to maintain good form with the seated cable row, and much less pressure is placed upon the lower back.
The great thing about cable stations is the ability to easily change the handle attachment. The cable row can be performed with an array of attachments, allowing the athlete to experiment with various grip positions.