Hip posterior

Squatting will not sufficiently train all the muscles of the Hip posterior as we are told to believe, and in some cases a squat will barely even challenge a glute depending on the individual structure and how they execute it.
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If the goal is building a big “butt”. Maybe we need to start looking into all the movements the hip can do, as well as effectively challenging those muscles with the right exercises.
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For the posterior of the hip we have “external rotation, abduction and extension. What exercises can we do to for these movements?