The Plate-Loaded Pullover is ergonomically designed to reduce tension and provide exercisers with increased stability and control. The seat is angled and the degree of shoulder extension is decreased for stability and reduced shoulder joint stress, respectively.
The latissimus dorsi, which is a large back muscle that fans out from your upper arm bone to your spine and then extends down to your hip bone, assists during the pullover exercise. Several other muscles, including the rhomboids, rear delts, and triceps, are also involved as secondary movers. Training big muscle groups like chest and back together usually isn't the norm, hence the dilemma that is created when it comes to pullovers.
Pullovers are one of the most underrated exercises. Besides improving stability and mobility in the shoulders (when performed properly), they also tax nearly every muscle in the upper body.