Serratus training goes viral

A small muscle that most lifters ignore just became the star of fitness X after a serratus-focused cable drill from BerbarianWizard spread widely on April 10, 2026, pulling more than 10,000 likes into a debate about shoulder shape and shoulder function. (x.com) The serratus anterior sits on the side of your rib cage just below the armpit, and Cleveland Clinic describes it as part of the muscle system that helps move the shoulder blade and support breathing. In leaner people, its rib-by-rib outline is the “finger” pattern you see along the side of the torso. (clevelandclinic.org) Your shoulder blade does not bolt straight to your ribs like a door hinge. American Council on Exercise explains that it glides over the rib cage at the scapulothoracic joint, which is why muscles that control that glide can change both how your shoulder moves and how it looks. (acefitness.org) The serratus anterior’s main job is to pull the shoulder blade forward around the rib cage and help rotate it upward when your arm goes overhead. That is the motion behind reaching for a high shelf, throwing a punch, or finishing the top of a push-up. (jospt.org) When that muscle is not doing its share, the shoulder blade can drift out of position instead of staying flat. Cleveland Clinic says injuries to the muscles or nerves that support the shoulder blade can lead to scapular winging, where the blade sticks out and overhead movement can feel weak or painful. (clevelandclinic.org) That is why coaches and physical therapists care about the serratus even when the internet is talking about aesthetics. American Council on Exercise notes that the shoulder complex has to balance mobility and stability at the same time, and the shoulder blade is connected through 17 muscles that have to coordinate for overhead work. (acefitness.org) The viral drill is basically trying to load the last part of that motion: arms start overhead, the cable comes down toward the thighs, and the shoulder blades finish by wrapping forward around the ribs. That final reach is the same extra “plus” used in rehab drills to make the serratus do more of the work. (x.com) (nata.kglmeridian.com) Researchers have been measuring that with electromyography, which is the electrical readout of how hard a muscle is working. A 2019 systematic review in the Journal of Athletic Training, covering 19 studies and 356 participants, found that the standard push-up plus produced high serratus anterior activity. (nata.kglmeridian.com) The same review found that adding wobble and unstable surfaces did not magically improve the exercise. In that analysis, unstable setups raised upper trapezius activity by 2.74 percentage points, while stable push-up-plus variations better favored the serratus. (nata.kglmeridian.com) There is also a reason wall slides keep showing up in shoulder programs. A Journal of Orthopaedic and Sports Physical Therapy study found wall slides activated the serratus anterior effectively at 90 degrees and above, which makes them useful for people who need overhead work without jumping straight to heavier pressing. (jospt.org) So the internet is not wrong that the serratus is trainable, and it is not wrong that better serratus control can change the look of the side torso. The part social media usually skips is that one cable variation is not a magic fix for shoulder pain, because the same shoulder blade still has to coordinate with the trapezius, rotator cuff, rib cage, and the rest of the shoulder complex. (acefitness.org) (clevelandclinic.org)