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Frank bent arm laterals in Stay Strong Mama

Lifting dumbbells to sides, abducting away from bodt.

Doing them standing with vertical torso targets middle delt. Doing them bent over with prone torso targets back delt.

Bending elbow shortens lever and makes it easier. Also adds extenal rotation component to his teres kinor and infraspinatus, also posterior delt.

Frank Castillk does upright bent-elbow laterals in Stay Strong Mama.