Lats (AKA Latissimus Dorsi) are the large V-shaped back muscles on either side of your torso. You have a left lat, and a right lat. On each side, they connect from under your arm pit, on your humerus (upper arm bone), to the iliac crest, just above the top of the back of your pelvis! Lats are used in almost all back/pulling exercises. They internally rotate your shoulders, adduct your arm (or bring it closer to your ribcage), and extend the arm back behind you. Thet help pull things closer to your body. Lats are also known in bodybuilding circles as the ‘Wings’. The bigger your lats, the wider you will appear from the front. Google “Chris Bumstead Lats” to see what we are talking about!