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@rgood Maybe. I'm not sure which position is safer re: shoulder impingement, but your shoulders are probably safer with an arched back because you can more efficiently recruit surrounding muscles during the movement.

@captscotted I would guess that when arching you can more efficiently activate the muscles associated with the lower portion of the pec major, which are necessarily bigger than those of the upper chest, allowing more output force (think incline vs decline bench press). As well, you have improved...

@dawn16 What I've always heard, which may be total bs but hear me out, is that arching one's back is fine/beneficial because (1) you're not loading your spine so you're not creating any significant shear force, and (2) you can stabilize your shoulders better because of the increased lat...