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I think there’s really only two feasiable ways to train the serratus: scapular protraction, which realistically the best option you’re gonna find to sufficiently isolate protraction and that’s actually loadable, is on a pin loaded hip thrust. Maybe a plate loaded one too if it’s really heavy or you already have it loaded up while training FB. Maybe a smith machine ag a stretch. And upward scapula rotation, as such (gonna happen in any Y raise basically) #sciencebasedlifting #sbl #gymadvice #bodybuilding #serratusanterior