Glute Activation - I don't get it

I have no idea what people mean when they talk about activating the glutes while running. It seems like there's really two things that are being discussed: things to consider or do before a run or as an exercise versus things to consider or do while running. Even with that clarification, I typically have no idea what people mean when they say to activate a glute, engage a glute, or even to flex a glute. But I'm trying to figure it out.

Some videos that I’ve thought were helpful
Explaining Gluteal Amnesia
   • How To Awaken Your Glutes (DO THESE EVERYD...  
Glute Exercises I like
   • The Best 25 Glute Exercises  

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Running footage shot on:
GoPro Hero 8 Black (paid link)
https://amzn.to/2J6iv3j

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Jim Yosef - Checkered
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