What does that even mean?!?
When presentation / video / performance coaches give the advice "be authentic", they NEVER give real tactics.
And then, when coaches DO give tactics, it's always the opposite of "be authentic":
What they actually teach is: "Do what I do and be just like me."
So your success is completely based on if you are similar to your coach.
Best case scenario: you become a cheap, mini-me version of your coach.
But more likely: you fail, and you're out of luck.
That's a bad deal. So please, make a pledge and repeat after me:
"I will never do that to myself again."
Now let's do it the right way: