The Importance of Lats, Back, & Posture. 10 Moves with NFL pro Zach Harrison. First week training with Falcons defensive end Zach Harrison. Emphasis was finding his lats & upper back muscles in order to dial in postural mechanics & full body alignment. If you’ve noticed my recent posts have been emphasizing posture. Although I’ve always been a huge advocate for posture, the last year I’ve had some mini epiphanies in terms of appreciating the absolute critical nature of how important proper postu