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Both exercises work the same lower body muscles, but SLDL work the arms, shoulders, traps, and upper back and GM don't
Really? Try doing them without using your arms, shoulders, traps and upper back!
Good mornings, SLDLs, Romanian deadlifts (which are virtually identical to a properly executed SLDL), off the floor deads, sumo deads and rack pulls are all variations on the theme of "posterior chain" work.
The differences have to do with the placement of the forces. RDLs/SLDLs place relatively more focus on the hamstrings; owing to the higher placement of weight, GMs place relatively more torque on the lower back and glutes . Off the floor and sumo deads hit traps, back, glutes and hams like there's no tomorrow. Rack pulls de-emphasize some of the ham - and by limiting the range of movement, allow you to lift a heavier weight through this top half, so there will certainly be more trap involvement.
They ALL activate core, and they're ALL good.
I loves me a good heavy pull.![]()