There are many people showing images and videos in which posterior pelvic tilt is suggested to maximize the glutes activation in some exercises. One of this is hip thrust.

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Since glutes may posteriorly tilt the pelvis, I understand that working in ppt may increase their ROM. But... why is it safe with an external load (for instance a barbell in hip thrust)?

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I'd say that the barbell generates some shearing and compressive forces on the low back. Why can we keep it flexed?

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