The trapezius muscles (traps) are flat, triangular muscles that extend from the neck down between the shoulder blades. The latissimus dorsi (lats) are large, triangular muscles that run from beneath the shoulders down to the lower back on each side. The spinal erectors consist of several muscles in the lower back that protect the nerve channels and help keep the spine upright.

Developing both width and thickness in the back is essential for building a balanced, high-quality bodybuilding physique. Strong back muscles are also crucial for carrying and lifting heavy weights. The most effective ways to train the back include rows and pulldowns.