Breathe into the belly first and then brace or the other way around? (squats/deadlift)

When doing beltless squats and deadlifts, should I breathe into my belly, expanding the entire core and then contract the abs OR contract the abs first then breathe into the belly?

I personally find my core to be tighter when I contract the abs first then breathe into the belly but not sure if this correct or not.

submitted by /u/Johnson_lee
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