This advice is for women, specifically: Take up space.
As girls, many or most of us are taught to be "ladylike" (whatever that means) and to cross our legs, be polite, not be crass. We receive endless messages regarding our bodies and their corresponding value. We receive messages that tell us we do not have agency over ourselves. We learn early that other people (namely men) have de facto rights to our bodies: to judge us, make decisions for us, and encroach on our space.
Many of us, correspondingly, have shrunk into the shadows of ourselves. We don't speak up even when we know the answer. We are afraid to offend people, to be impolite, to appear "angry". We cross our legs and close our mouths and just allow life to happen to us. We go along to get along.
Boys and men receive opposite messages: Spread out. Take what you want. Be confident and aggressive.
I want to teach my daughter, and re-teach all the women, to take up all the space you need in order to feel safe in your body, to feel confident, to feel like you own the air around you. Don't let anyone make you feel small. Don't agree to be quiet. You have as much right to be heard full-voiced as anyone. Speak up.
You are a child of the universe, no less than the trees and the stars; you have a right to be here.
(from "Desiderata" by Max Ermann)
So, the advice today for the ladies: take up space. Manspread. Say what the f*** you mean. Be your own advocate.