The straight-arm pullover, typically performed on a weight machine or with a dumbbell, primarily targets the latissimus dorsi muscles of the back. Secondary muscles engaged include the pectoralis major and minor, the rhomboids, and the serratus anterior. This exercise contributes to developing a wider back and improved shoulder stability.
Developing these muscle groups offers several advantages, including enhanced posture, increased strength for pulling movements, and a more defined upper body physique. The straight-arm pullover has a long history in bodybuilding and strength training, once considered a key exercise for expanding the rib cage, although this claim lacks scientific validation. Its enduring popularity stems from its effectiveness in targeting specific muscles difficult to isolate with other exercises.