DescriptionMajor pulling muscle used in rows, pull-downs, and pull-ups. Essential for back width.OriginLower six thoracic spine, lumbar spine, sacrum, top of the hip boneInsertionFloor of bicipital groove of the upper armPrimary ActionsPull the arm backward, Bring the arm back toward the body, Turn the arm inwardAlso Known Aslats, lat 
