When we talk about back movements in weight lifting, we are mostly referring to the Latissimus Dorsi muscle because it’s the largest and most visible muscle of all the back muscles. It is the Major Muscle Involved (MMI) and most exercises are focused on the Lats. The other back muscles like the Rhomboids, Erector Spinae, Quadratus Lumborum are active with these movements, but are not MMI’s. They are mostly aiding and guiding muscles and actually get worked indirectly. Refer to Latissimus Dorsi-Quadratus Lumborum & Rhomboids / Erector Spinae for full details on these muscles including their attachments and actions.