Your dorsal muscles are the muscles on the back side of your body. “Dorsal” basically means “toward the back.” When people talk about training the back, they’re usually talking about several major dorsal muscle groups that work together to move your shoulders, spine, and hips, and to stabilize your torso.
The largest and most well-known dorsal muscle is the latissimus dorsi, often called the “lats.” These broad muscles run from your lower and mid back up to your upper arm. They help you pull your arms down and back, like in pull-ups, rows, and lat pulldowns. Strong lats also help create that V-taper look, which can make your waist appear smaller and your abs more visible.
Across the upper back you have the trapezius and the rhomboids. The trapezius helps control your shoulder blades and neck posture, while the rhomboids pull your shoulder blades back and together. These muscles matter for good posture, shoulder health, and a strong, stable upper body when you train chest and arms.
Along the spine are the erector spinae, a group of muscles that help you extend and stabilize your back. They work hard during deadlifts, hip hinges, squats, and loaded carries, keeping your torso braced and your ribs and pelvis in better alignment.
For visible abs, dorsal muscles are a big deal because they support posture and core control. If your upper back is weak and your shoulders round forward, your ribcage can tip and your midsection may look less defined even at the same body fat level. Training your back builds a stronger “frame,” improves how you hold your torso, and helps you generate better tension during ab exercises. In short, a well-developed back doesn’t just look good, it helps your abs show better and perform better.