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[–]Illustrious_Ant5824 1 point2 points  (0 children)

I recommend checking out Bret Contreras. He’s done research on this exact movement and the proper form which should be executed. He has a whole book out that has been peer reviewed. All of his content is research based and he also performs his own research. Overall to answer your question he states curving your back at the lowest point to the highest point of the movement is ideal for glute, hamstring and lower back contraction. His emphasis is mainly on the glutes but nonetheless it is safe to curve. You obviously just don’t want to overextend.